It's not a 33% drop from direct drive to low gear, rather 25%. The ratios of all S-A 3-speeds are 0.75, 1, and 1.33, so you can do the math. However, the percentage _increase_ from low to high does calculate to 33% increase in both steps, ie, 33% from 1st to 2nd, and another 33% from 2nd to 3rd. Also, if you change the chainline by adding spacers to the axle, you would have to re-dish the wheel because it wouldn't be centered in the frame any more. However, if you do it by putting spacers under/over the sprocket (or flipping a dished sprocket, as you showed), it won't change the centering of the wheel, just move the chainline. 😀
Consider the beach cruisers single speed model ! You would deffinately want one of these then! In wondering if an old one would hold up! My brother has an old stermy archer 3 speed hub off of and old murray bike! I have considered a 2 stroke engine and a Jack shaft kit!
Hi im building something similar at the moment. May i ask about the Spoke lenght? And also did the IGH hold up to the bbshd power? Very helpfull video my man.. thnx ✌😃👌
he will NEVER answer you I asked that a couple years ago he is an IDIOT because he did NOT build the bike he had it done by someone else SO he KNOWS NOTHING ABOUT IT
I hope somebody sees this ! Where did you get that cog ! I need a cog with a few more millimeters more dish outwards to get my chainline straight ! Or I could spend $200 on the Lekkie 40t and cover. I saw something from England, supposed to be for chopper bike with 10mm dish, but that might put the cog too far to the out side. I still have to determine the exact amount of dish needed. I’ve considered doing it myself with some machine shop, sounds rather costly though. Thanks for any help...
hi, I know the video is very old and maybe my question would be inappropriate to ask, but still. I can't buy this bushing right now, it's just not available. can you tell me where I can buy it?
Great video : ) Thank you. It would be great if you can help me with my new bike build as I am looking at a Sturmey Archer 3 speed. I need some insight on fitting them. There are no resourceful bike shops and I've seen just one guy with SA igh so far in my country. I have a Cult 29" devotion bmx bike. The rear dropout is at 110mm and there is a version of the SA 3 speed hub that has 118mm OLD. Do you think that they can work together? I can play with the chainring and cog teeth numbers and get some very nice gear ratios. I have other questions, but lets start here.
Hello. I am very interested in your phattcycle bikes. I am doing research on how much it would cost me and a complete parts list. The sx-rk3 hub looks like a great upgrade for me because i also am interested in low end torque just like .Can you help me get started please ? Your TH-cam videos are awesome. Thank you .
Put a sx-rk3 on my bike, but the torque is so strong that it 'skips'. Did you ever have that problem? I notice in videos right after this you went with a 1 speed!
I have this same hub on all 3 of my bikes and the trick to STOP the skipping is to REVERSE the chain TENSIONER to push UP instead of down look at a couple of my videos i explain this
@@jaygoodwin5502 That will also work I even thought that route since i do have a couple atv's but I had already bought a couple tensioners and didnt wanna waste my money so I made a spring to work in reverse and push the chain up instead of down.
Hello. Thanks for the video. What are you doing for the disk brake? Is it just not mounted yet? I have a buzzraw, and the same IGH, but it seems like I need to get spacers to move the brake caliper toward the center in order to get enough axle to bolt on outside the frame? Just curious what you did, or if you have any pictures of the left side of the hub? thanks
Thanks for your question. Just uploaded a video showing a closer shot of the Shimano Zee 203's and how we installed them. Let me know if you want more details. Ride safe!
Hi! Thanks for all the info on the video, really helpful, I’m looking at doing the same conversion myself, could you help me out with spoke length I will need to build the hub up to a 20’’ super 73 rim please? Many thanks, Matt
I recently purchased an eBike that has a Sturmey Archer SX-RK3 internally geared hub the same as yours, in first the thing is silent the way I believe it should be, in second and third the thing is noisy as hell, it's also near impossible to shift gears as I need to press the changer in so HARD that it feels like I'm going to break the thing and it makes this awful click click click noise, it eventually switches but then it's just as tough getting it back down to first. I have no idea what's happening with it but am hoping you or someone here might be able to give me a clue? Cool video :)
Hey! Sorry to hear about the trouble. I would recommend using a twist shifter or Sturmey-Archer's suicide shifter as it is indeed at bit hard to shift as shifter moves a lot of the mechanism inside around. With a button shifter you might not be getting the leverage as you might with a twist shifter or suicide. Concerning the clicking, I would recommend locating a wheel builder in your locality to dismantle and have a look and or clean the internals. A local bike shop might help but in our experience they don't like unusual mechanical work. Let us know how things turn out!
@@urbancargobikes4930 Thank you for the response :) I'm going to look at twist shifters today - The noise only occurs in 2nd and 3rd so I think you are right in saying it needs looking at. Thanks again mate, really appreciate it
@@ty1978 no this is normal for the clicking in 2nd and 3rd gears But as for the shifting just make sure you have NO PRESSURE on the drive train before you shift because its more like a Manual Transmission in a car
You wont have any problems with the hub on the BBSHD all 3 of my bikes I converted to this HUB. He does NOT answer any questions because he DOES NOT KNOW because he did NOT build it he had someone else do it for him so he KNOWS NOTHING
With a 42T chainring and an 18T on the SX-RK3 Low gear is equivalent to having the 42T driving a 24T gear on a Derailleur system. Second Gear is direct drive so same as 18T on a Derailleur. High gear is the same as driving a 13.5T gear on a Derailler. So a split the difference of a 14T and a 13T. The Low is just 18 divided by 1.3333333 and the High is the same as Multiplying the 18 by 0.75.
I could make it work with some creative machining on the drop outs and on a special nut. Your disc brake caliper would have to be offset a good bit. So more creative machining. The sprocket would probably be too far inward. Because the three little protrusions are not very strong and I am driving mine with a stout motor, I carved some slots in the output portion of the hub, and filed in some 1/8 by 1/16 inch notches in the sprocket. I made up a 1/4 inch aluminum circle which bolts to the sprocket and is also notched so that 1/8 inch square keys fit along the output hub. The aluminum is drilled and tapped for set screws to hold the sprocket in line and to force the keys That arrangement might be able to get the sprocket at the end of the drive output and allow a chainline that makes sense.
Dont WASTE your money you can accomplish the same thing by changing the front chain ring to a 30Tooth and use a stock SA rear gear what ever size you want to use they make the stock SA gears to 24 tooth for about 6 usd
The SX-RK3 IGH is recommend for 180mm max but they just barely fit on our bikes with 190mm width. Fat tire specific IGH's are extremely rare compared to more standard sizes. There's the Rohloff but it's thousands to buy and then more to build into a rim AND then will require a specialist to maintain.
@@urbancargobikes4930 Can you please explain what you did to make them fit? Just squeezed the frame drop outs in 10mm? Used spacers on the axles? I need to order two hubs for Recumbent Trikes & would prefer to know what I am getting myself into first? Thanks for your help.
No sorry, gear sensors are for people who don't know how to shift a standard transmission and who prefer automatic transmissions.. Having to stop pedaling and shift manually gives me more feel for the machine. What's your experience?
Urban Cargo Bikes Agreed. I don’t use a gear sensor. I don’t use brake sensors either. I have 42T Lekkie also and I ride almost exclusively off road, frequently on muddy fire roads.
Urban Cargo Bikes I just destroyed my SRAM x9 derailleur during my last trail ride. I’ve been thinking of going IGH for years. Sturmey Archer is a far better option for e-fatbikes than the $1400 Rohloff, imho. I don’t need 14 gears, plus the SA is obviously less expensive. I also have 1000w Bafang. I have pinned the throttle back numerous times with no cog shredding issues or chain shipping. Until the derailleur incident, I had zero mechanical issues with the config I was running. Performed beautifully.
@@cwilsonyt That's awesome. Please keep us posted as to what you decide to go with. We're sticking to the Sturmey-archer for now because it's so cheap and durable.
@@shockadellick what is this SPECIAL wrench your talking about I did NOT need anything special what the hell were you trying to do or was it a completely different hub and you posted on the WRONG video
![เป็นไปได้ไหม - WanMai [Performance Video]](http://i.ytimg.com/vi/Eh5hItD4Mr0/mqdefault.jpg)
I have the 5 speed version, I recommend never power wash near or on the hub. Sturmey Archer Ball races have dust caps only.
It's not a 33% drop from direct drive to low gear, rather 25%. The ratios of all S-A 3-speeds are 0.75, 1, and 1.33, so you can do the math. However, the percentage _increase_ from low to high does calculate to 33% increase in both steps, ie, 33% from 1st to 2nd, and another 33% from 2nd to 3rd.
Also, if you change the chainline by adding spacers to the axle, you would have to re-dish the wheel because it wouldn't be centered in the frame any more. However, if you do it by putting spacers under/over the sprocket (or flipping a dished sprocket, as you showed), it won't change the centering of the wheel, just move the chainline. 😀
Consider the beach cruisers single speed model ! You would deffinately want one of these then! In wondering if an old one would hold up! My brother has an old stermy archer 3 speed hub off of and old murray bike! I have considered a 2 stroke engine and a Jack shaft kit!
Ya, classic man!
Chain line huge! Great video 👊👊💪💪
Hi im building something similar at the moment. May i ask about the Spoke lenght? And also did the IGH hold up to the bbshd power? Very helpfull video my man.. thnx ✌😃👌
he will NEVER answer you I asked that a couple years ago he is an IDIOT because he did NOT build the bike he had it done by someone else
SO he KNOWS NOTHING ABOUT IT
I hope somebody sees this ! Where did you get that cog ! I need a cog with a few more millimeters more dish outwards to get my chainline straight ! Or I could spend $200 on the Lekkie 40t and cover. I saw something from England, supposed to be for chopper bike with 10mm dish, but that might put the cog too far to the out side. I still have to determine the exact amount of dish needed. I’ve considered doing it myself with some machine shop, sounds rather costly though.
Thanks for any help...
im about to start setting stuff up,,, you make me nervous mate hahaha
Never mind. I sold some stuff on Craigslist and ordered the Lekkie 40t & cover. The money was burning a hole in my pocket.
@@stevenreyes3680 socket bro.. sock et.... lol
where did you buy the rim? thanks!
hi, I know the video is very old and maybe my question would be inappropriate to ask, but still. I can't buy this bushing right now, it's just not available. can you tell me where I can buy it?
A Fat bike SA hub 😮 Sweet...
Has the sturmey archer failed mechanically with all that power?" Been hearing some do and some don't.
Hi Urban Cargo Bike are you demonstrating this great video this with a 4" or 3" fat tire?
Hey, thanks! We use 4 inch wide x 20 inch tall fat tires on our bikes. So plush!
Very useful information thank you
Thanks for the vid. What's the width of that hub. I'm starting to consider a IGH for my fat bike but it's 197mm spacing.
Hey I really like your videos. Can you make one on how to properly install the sx-rk3 on the bicycle
please tell me where did you buy your hub?
That hub!
Fit on my swchinn spoiler!?
Where i can buy one
Nice stuff
Great video : ) Thank you.
It would be great if you can help me with my new bike build as I am looking at a Sturmey Archer 3 speed. I need some insight on fitting them.
There are no resourceful bike shops and I've seen just one guy with SA igh so far in my country.
I have a Cult 29" devotion bmx bike. The rear dropout is at 110mm and there is a version of the SA 3 speed hub that has 118mm OLD. Do you think that they can work together?
I can play with the chainring and cog teeth numbers and get some very nice gear ratios.
I have other questions, but lets start here.
Sorry to hear that. We are running 2 and didn't need any special wrench to setup. Maybe you have an older design?
Hello. I am very interested in your phattcycle bikes. I am doing research on how much it would cost me and a complete parts list. The sx-rk3 hub looks like a great upgrade for me because i also am interested in low end torque just like .Can you help me get started please ? Your TH-cam videos are awesome. Thank you .
I'm in Winnipeg. Thanks again
Put a sx-rk3 on my bike, but the torque is so strong that it 'skips'. Did you ever have that problem? I notice in videos right after this you went with a 1 speed!
I have this same hub on all 3 of my bikes and the trick to STOP the skipping is to REVERSE the chain TENSIONER to push UP instead of down look at a couple of my videos i explain this
@@pharrohku5922 yup. It absolutely was the chain skipping. I put an ATV chain tensioner wheel on it!
@@jaygoodwin5502 That will also work I even thought that route since i do have a couple atv's but I had already bought a couple tensioners and didnt wanna waste my money so I made a spring to work in reverse and push the chain up instead of down.
Hello. Thanks for the video. What are you doing for the disk brake? Is it just not mounted yet? I have a buzzraw, and the same IGH, but it seems like I need to get spacers to move the brake caliper toward the center in order to get enough axle to bolt on outside the frame? Just curious what you did, or if you have any pictures of the left side of the hub? thanks
Thanks for your question. Just uploaded a video showing a closer shot of the Shimano Zee 203's and how we installed them. Let me know if you want more details. Ride safe!
Hi! Thanks for all the info on the video, really helpful, I’m looking at doing the same conversion myself, could you help me out with spoke length I will need to build the hub up to a 20’’ super 73 rim please?
Many thanks,
Matt
bro no answer , same question as me lol.. im about to order 165mm.. should work im hoping hahaah... how is yr Build going mate... let me know
@@smarc1325 Just curious how did you come up with that length of spoke for the 20" x 4.0 fatbike wheel
@@pharrohku5922 trial n error..
But i ended up with 157mm....
The Sturmy Archer sx rk3 works gr8t by the way..✌️👍🙋🏼♂️
I recently purchased an eBike that has a Sturmey Archer SX-RK3 internally geared hub the same as yours, in first the thing is silent the way I believe it should be, in second and third the thing is noisy as hell, it's also near impossible to shift gears as I need to press the changer in so HARD that it feels like I'm going to break the thing and it makes this awful click click click noise, it eventually switches but then it's just as tough getting it back down to first. I have no idea what's happening with it but am hoping you or someone here might be able to give me a clue? Cool video :)
Hey! Sorry to hear about the trouble. I would recommend using a twist shifter or Sturmey-Archer's suicide shifter as it is indeed at bit hard to shift as shifter moves a lot of the mechanism inside around. With a button shifter you might not be getting the leverage as you might with a twist shifter or suicide.
Concerning the clicking, I would recommend locating a wheel builder in your locality to dismantle and have a look and or clean the internals. A local bike shop might help but in our experience they don't like unusual mechanical work. Let us know how things turn out!
@@urbancargobikes4930 Thank you for the response :) I'm going to look at twist shifters today - The noise only occurs in 2nd and 3rd so I think you are right in saying it needs looking at. Thanks again mate, really appreciate it
@@ty1978 no this is normal for the clicking in 2nd and 3rd gears
But as for the shifting just make sure you have NO PRESSURE on the drive train before you shift because its more like a Manual Transmission in a car
hello.Have you had problems with the rear hub in combination with this bbshd motor?
You wont have any problems with the hub on the BBSHD all 3 of my bikes I converted to this HUB.
He does NOT answer any questions because he DOES NOT KNOW because he did NOT build it he had someone else do it for him so he KNOWS NOTHING
With the Lekkie 42t Chainring front and the 18t rear cog on the Sturmey, ,what would a comparable derailleur combo be in the lower(climbing) gear?
With a 42T chainring and an 18T on the SX-RK3 Low gear is equivalent to having the 42T driving a 24T gear on a Derailleur system. Second Gear is direct drive so same as 18T on a Derailleur. High gear is the same as driving a 13.5T gear on a Derailler. So a split the difference of a 14T and a 13T. The Low is just 18 divided by 1.3333333 and the High is the same as Multiplying the 18 by 0.75.
My fat bike rear fork frame distance is (190 mm), So is that geared hub Sturmey-Archer SX-RK3 can fit with that frame? Thanks for posting the vid.
I could make it work with some creative machining on the drop outs and on a special nut. Your disc brake caliper would have to be offset a good bit. So more creative machining. The sprocket would probably be too far inward. Because the three little protrusions are not very strong and I am driving mine with a stout motor, I carved some slots in the output portion of the hub, and filed in some 1/8 by 1/16 inch notches in the sprocket. I made up a 1/4 inch aluminum circle which bolts to the sprocket and is also notched so that 1/8 inch square keys fit along the output hub. The aluminum is drilled and tapped for set screws to hold the sprocket in line and to force the keys That arrangement might be able to get the sprocket at the end of the drive output and allow a chainline that makes sense.
yes it will fit with NO ISSUES at all mine is also 190mm you can see my videos I posted about it .
The custom sprocket from Holland. Care to share where to obtain one ?
Thanks 😊
hollandbikeshop.com/en-gb/
Dont WASTE your money you can accomplish the same thing by changing the front chain ring to a 30Tooth and use a stock SA rear gear what ever size you want to use they make the stock SA gears to 24 tooth for about 6 usd
Where in the world can I get hold of an SX-RK3?
i got mine delivered last week haha juhuu ebay America... im in Switzerland., imagine
can you adjust the chain alignment on the hub?
yes by using a flat , dished or deep dish rear gear
How's the drag compared to a hub motor?
Zero... There is no drag with a Mid-Drive motor because it freewheels. There's slight drag with a 3 speed IGH but you literally can't tell.
You put a timing belt and toothed wheels instead of chain and sproket
Is the SX - RK3 for 190 mm drop outs? Are there other IGH's for Fat Bikes to choose from? Thanks.
The SX-RK3 IGH is recommend for 180mm max but they just barely fit on our bikes with 190mm width. Fat tire specific IGH's are extremely rare compared to more standard sizes. There's the Rohloff but it's thousands to buy and then more to build into a rim AND then will require a specialist to maintain.
@@urbancargobikes4930 Thank you. You might find this info useful. - mid-islandadventures.weebly.com/ig-hubs.html
Can you get away with using this on a 190mm? Can you still get it on the 190mm size
@@urbancargobikes4930 Can you please explain what you did to make them fit? Just squeezed the frame drop outs in 10mm? Used spacers on the axles? I need to order two hubs for Recumbent Trikes & would prefer to know what I am getting myself into first? Thanks for your help.
@@Dave-rk2nl yes you can look at the videos I posted about it on my bikes
Can you still get this to fit 190 mm size even if it's just barely makes it it should fit right or not
yes it will fit with NO issues mine is 190mm and I just squeeze it a little and put the nuts on.
How do you get the cog off
a very STRONG C CLIP
Have you considered a gear sensor?
No sorry, gear sensors are for people who don't know how to shift a standard transmission and who prefer automatic transmissions.. Having to stop pedaling and shift manually gives me more feel for the machine. What's your experience?
Urban Cargo Bikes Agreed. I don’t use a gear sensor. I don’t use brake sensors either.
I have 42T Lekkie also and I ride almost exclusively off road, frequently on muddy fire roads.
@@cwilsonyt Very cool! What gearing system do you prefer for your mid-drive ebike?
Urban Cargo Bikes I just destroyed my SRAM x9 derailleur during my last trail ride. I’ve been thinking of going IGH for years.
Sturmey Archer is a far better option for e-fatbikes than the $1400 Rohloff, imho. I don’t need 14 gears, plus the SA is obviously less expensive.
I also have 1000w Bafang. I have pinned the throttle back numerous times with no cog shredding issues or chain shipping. Until the derailleur incident, I had zero mechanical issues with the config I was running. Performed beautifully.
@@cwilsonyt That's awesome. Please keep us posted as to what you decide to go with. We're sticking to the Sturmey-archer for now because it's so cheap and durable.
Building a 29” BMX, thinking of internal hub.....
shockadellick thank you, glad I didn’t buy yet!
@@shockadellick what is this SPECIAL wrench your talking about I did NOT need anything special what the hell were you trying to do or was it a completely different hub and you posted on the WRONG video
where its the brake
How much are these
100 USD