Convert One Piece Crank To Three Piece Crankset/Bottom Bracket
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- I show how to replace 1 piece ("Ashtabula") cranks with modern 3 piece cranks using an adapter. These one piece cranks were mainly found on older American made bikes like Schwinn, Huffy, Ross, etc, BMX bikes, and childrens bikes. The bottom bracket shell is larger and the cups are pressed in. But with adapters, you can install a variety of English threaded bottom brackets like square taper sealed cartridge, Octalink, GXP, Hollowtech, or whatever. I also show how to deal with issues like ridges/obstacles inside the BB shell, and also dealing with a 65mm versus a 68mm BB shell. The benefits are a lighter crankset and also the ability to change to different chainrings. It's a cool upgrade to a vintage bicycle. The inside diameter of Ashtabula is 51.3mm.
The adapter I used is called American To Euro BMX Adapter and was made by Truvativ. Here it is at Amazon: www.amazon.com/...
Here is a similar American To Euro adapter made by Black Ops: www.amazon.com/...
Another one piece crank system is Fauber which has an inside diameter of 45mm. Search google for "Fauber conversion adapter".
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Hi RJ, I just did this to an old Schwinn Varsity. I had a 122.5mm bottom bracket laying around, but the chainline was 55mm with my crankset. I need it to be around 43mm to line up with the center of my freewheel. What length BB will take 12mm off of the drive side? I'm stumped. 98mm is absurd, but 110 only removes 6mm from each side.
what is the part number of adapter? thanks
How to order bottom braket?
Im from philipines.
er so ?
Hi, Rj where did you find the pacers you used ?
I cannot believe that your channel exists with EVERY single video I've needed for building a bike!
Much respect to a man who changes out a bottom bracket in his Homer Simpson slippers. Absolutely here for this! Thank you!
Thanks so much for the help! I bought a beautiful 3 piece crank and sprocket but unbeknownst to me the inner diameter of the BB is far larger than the included threaded and sealed bearings so I ended up purchasing a conversion axle which is the same setup as a one piece crank but has a straight axle pressed in and ran through so you can attach and square hole crank arms. I prefer your mother although $30 more it allows you to use a variety more of cranks and better quality!
Great video, but let me be the first to compliment you on your footwear!
Footwear only a boss can wear.
Rj u are the light for us, you show us so many thing that isnt shown anywhere else on youtube!
please continue your content, it is a great service for the fast-rising biking community!
Yo RJ..I look up every tool and part you use in this crank conversion..I'm doing the old Ross ...very helpful chronology but but spindle measurements might be guess work...Thank you!
I'm an old man and ride a 1979 Schwinn Collegiate. Loved this video and will be converting to a 3 piece crank. Thanks RJ.
thank you so much i was looking if adapters worked for HOURS
Glad my video was able to help.
R.J. & his Super Steel toe capped Simpson Slippers. :)
I just did this project and was able to convert a one-piece to a hollowtech II road crank for my Dad's rat rod! I used a headset press for the drive side cup; a drift fit the inner portion. I also smeared a little bit of grease on each cup prior to install. Unfortunately, I was without Homer slippers. So, the overall job took a hit!
Wow ! Tremendous video ! Thank you so much! Best wishes from Guatemala ! 🤙🤙🤙
What type of 1.5mm spacers are those?! Did you have to modify something that size already or are those headset spacers?? Just picked up a 73' Contentional that I'm going to do this on, thank so much for this Awesome video!!!!
1) Hand protective gloves: -Missing-
2) Eyewear protection : -Missing-
3) Heavy Duty "Homer" protection Shoes: -CHECK-✔✔👍👍
Thanks for the informational video, really appreciate your work. Thanks
Awsome , exactly what I needed ! Thanks a bunch . Cheers from downunder 😃
I like this video but prefer the one piece cranksets. I've been able to find a lot of chainring sizes from 25T to 50T. The simple one piece can be rebuild quickly with common tools.
make a video on (5PCS bottom bracket). please i request you very much 🙏
Great video thanks. I have a 1971 Schwinn
I have a 1971 Schwinn super sport. What would be the best BB and crankset for this conversion? Thanks
Probably a sealed cartridge. BB. But after that, it's up to.
Came here for the old school tech. Stayed for the Homer Simpson house slippers.
Thank you!
Thank you body, you videos help me too much I appreciated
LOVE YOUR HOMER J PIMPSON WORK BOOTS 👍🏾👍🏾👍🏾👍🏾
nice slippers
Hi i buy a schwinn frame 1970 i am going to make like fixie bike, what size i can buy the bracket and the crank, thanks for the help you can give me
I did this to my schwinn del mar mens cruiser (Walmart) couple years ago and it's working great still !
Thank you for the memories RJ. Bill M.
I want to do the same to my delmar. Do you have any links to the parts you bought? I want to make my Delmar go faster.
Nice slippers,
I wonder if i can install a three piece crank set on my Micargi puma ??
I have a question, I have similar shell like that one but it uses cottered cranks. Can I just simply replace it with a square taper spindle axle?
I am in the process of replacing my crankset on a 3 speed bicycle. Mostly worried about spindle length.
great video I never knew u could get an adapter for these cranks pretty cool 😉
Dura-Ace ready ! Spruce that old frame right up !
This channel along with the channel by cjhoyle - are the best bicycle repair channels on youtube.
How did you determine the width of the shaft you needed if you wanted to keep the same number of chain rings it started out with?
You want the chain to be straight between the center of the rear gear cog and the crank. It's called centerline and there's multiple ways to determine it. The easiest thing is just to use whatever length spindle typically gets used with the crankset you're putting on your bike.
Thanks for the video, I am upgrading an old Schwinn and really needed to know how this process works. Also, those slippers are great!
Thank´s for this vid, subscribed :)
nice homer simpson slippers!
EVERY time I need tips on a tricky bike issue, there he is. My man RJ. Thanks again for the great videos!
Pretty good video RJ . I always appreciate it when a how to do it U Tube is not overly long , just to entertain us. When the new shell cups are too long to allow seating up against the frame shell , another viable way to make them fit is to put the new BB threaded bushings in a lathe and face off the required amount to clear the "ridge in the frame shell' . a local small machine shop or networking friend with a lathe in his garage is not too hard to locate. this eliminates the hand grinding on both the frame and the bushing chamfers. OR , a person could also just use spacers , rather than grind or face off in the lathe. The actual " Q factor" or width of the outside dimension on the assembled new parts is not a big deal for most people.
Outstanding!! Now I know what to do!! I'm only 70 yrs young...putting it together for my granddaughter...you ARE THE MISSING LINK!!
With the shims on the bottom bracket, doesn't it off set the chain. And can this conversion kit work on a Miyata 718?
No. The BB is still centered, and the proper length for the cranks. Did the Miyata 718 ever come with one piece cranks?
I’m only 0:54 into the video, but I had to stop and give you a thanks already. I’ve been wanting to do this exact thing.
Have you ever tried to convert from a chain drive to a gates carbon belt drive and if so I have a retro style cruiser that I'm trying to convert if you have any information on are or curious on how to do it and can do there a video for it would be great
Do you have a bike collection video floating around? Or maybe a photo album on your FB page? I'd love to see all the bikes you have.
+minidini10 I have a bunch of photos on my facebook page.
Hi @RJTheBikeGuy! The thumbnail for this video appears on Google and links to a different video on a different TH-cam channel.
If you Google, "what's the difference between 3 piece crankset and 2 piece" and go to images, the 4th image is your thumbnail. However it links to someone's else's video. Thought you should know.
Hope this message finds you well. I own one of the newly manufactured Schwinn Stingray bicycles. I am looking into doing two upgrades, namely installing a gear hub (a Shimano Nexus 8-Speed, for example) and replacing the bottom bracket with a modern component. Regarding the second upgrade, I have learnt a lot from your video. Thank you so much for that. I would just like to know what size BB I need to install on the bike if I go for the cartridge type, whether you can name a specific brand, whether I can use a hollow axle, whether Hollowtech 1 and 2 are among my crankset options, and whether my proposed BB upgrade would have consequences for my plan to install a gear hub. (BB shell is the 68 mm type as far as I can tell. It is a single-speed bike with a coaster brake.) Best regards from Ankara, Turkey
Ashtabula did make those one piece cranks for Schwinn, and they were excellent, Very strong. I used them in BMX way back when, However, while Ross and Huffy did use one piece cranks (lower end models on Ross, most for Huffy) the Ross cranks were made by Wald. OK for their intended purpose, but not as good as the "Schwinn Approved" Ashtabulas. Schwinn cranks had a proprietary thread (28 tpi vs. standard 24 tpi IIRC). Huffy used some other brand that had a weird curve to them, and were a lot thinner and weaker. Removal and installation remained the same.
I did one of these, but I used a YST US bottom bracket, which basically used the same size cups, but used a square taper axle and these huge cartridge bearings. Runs smooth as butter.
Awesome vid. I'd like to know more about the spacers for a 65mm BB if anyone has any tips. Restoring an old Schwinn Traveler.
Thx nice Video.
I have a question, would you recommend sticking the adapter in? I'm afraid that the bottom bracket will turn when tightening.
Do the spacers come with the new crank parts? If not, how are they sized?
Great video, thanks. I am in the process of adapting a Huffy mtb, I was relieved to see it didn't have a ridge, then I saw that the chainstay tube ends come through and are too close to the outer edge! So i've now got a lot of filing to do, not having any grinding power tools. Truvativ seriously need to modify the design of these adapters!!!
Fantastic. I’m learning so much from your videos.
Superb how-to. 👍 I'm going to see if I can mod my brother's Sun trike for a 3-piece setup. Dunno if the cupped parts are removeable.
Buddy from Colombia has cool bikes but wants to convert his old schwinn 10 speed and found this video in a second because Im subscribed. Thanks so much. Any advice on getting a good chainline for wanting that ten speed to be a single speed?
I think the lip on the adapters would have brought up the width to 68mm. I don't think the spacers were needed.
How do I determine the length of the spindle I need for the sealed BB cartridge? I have a 68mm shell with no ridge inside, it's the same all the way through but the BB has 2 measurements. I need the spindle length and the one piece crank isn't a very good indicator, unless I'm missing something? I need a 68 x ??? cartridge and don't want to throw my chain line out!
It seems like the adapter manufacturer could also supply a few mm worth of shims to accommodate bottom bracket tubes of different lengths. I've seen thin shims for automotive rear-wheel alaignment, so the technology does exist.
awesome video! I've been trying to figure out how to put a more modern set of cranks on an old cruiser frame I love. Thanks for sharing!
if my bottom bracket width is 68mm (roughly) what width of crankset should i go with?
i have an bmx bike that uses a one piece crankset and it is just a pain to service for me as i dont have a good spanner / wrench for it as it broke so doing this would help a lot for me
May I know what what the bottom bracket adapter you were using? Is it a 30mm to 24mm for the square tapered bottom bracket?
It's been my experience with 3 piece cranks that both pedals wind up pointing the same direction. Getting you nowhere. 1 piece cranks are better.
I have an old 2004 casino cycle that I am replacing the one piece with a three piece crank. It looks like it’s going to take a 68 mm bottom bracket what is going to be the spindle length?
I had the cup depth issue. Why would they make them that deep? I put mine in a vice and hacked off half the adaptor with a sawzawll. Knocking them out of the frame when I found out they didn’t fit really sucked.
RJ you are The Man! One of my uncles gave me his old Schwinn Traveler to rebuild and upgrade, your videos are a big help they cut down on trial and error part of working on older bikes, thanks for what you do!
did the extra shims come with the kit? if not where can those be purchased? great vid btw
No they didn't. Local bike shop or ebay probably best bets.
Cool slippers. :) Much less scary than the old ones I think.
I'll watch the rest now...
Sadly, this page does not allow me to save this video in a list. I want to watch it again a few times over the course of modifying my bottom bracket.
This is awesome. Thank you so much. I have the same bike! Any advice to convert it to a single speed?
Thanks a bunch!!! I so happy to know how update my old-fashioned bike )
nice conversion I will do this one of my 50‘s frame cruiser
Thanks R.J. I needed this so i can change to 3 piece cranks on my bmx
Is that adapter Aluminum? With the coating removed is it going to be a problem reacting with the steel?
Hey RJ, thanks for this video.
I am about to upgrade my old botton bracket to a more modern one like you did on this video.
You job is very informative!
I have a vintage bike from 90's with a press fit just like this and I was wandering how to do the task.
This video helped me a lot!
Thanks!.
Great video! Love the Homer Simpson slippers by the way.
What's the crankset you installed? Great still styling for an older bike
Kung sino man naghahanap ng conversion kit meron ako bilhin niyo na
Hi sir can you please help me i need a adaptor like that my bottom bracket is thompson 40mm i want to convert this to a modern bottom bracket
I like new tech and everything, but is there seriously a problem with the one piece design?
I was unsure of how to set the new BB adapter in the frame, wood block is absolutely the easiest solution
Thankxz for this video. My old swhinn need convertion.
thank you SO MUCH
I KNEW IT WAS POSSIBLE
ALL THE STORES I WENT TO NEVER EVEN MENTIONED THE POSSIBILITY OF ADAPTERS
Funny they didnt know or just didnt tell you.........but some of the bigger "chain" bike shops are strictly OEM now-days. There were versions of this kit (several ways using both sizes of bearing diameters and sealed or lose) since the late 70's.
RJ can we use this method to convert from One Piece Crank to Hollowtech II/2 piece crankset?
I don't recommend anything other than cartridge bottom bracket with this.
I had same problem with my vintage german bike, bottom bracket cups were pressed too. I couldn't find solution myself, so I brought my bike to my local shop and they installed some kind of bracket with pressed cups. Obviously your solution is better, 'cause you can unscrew the bottom bracket whenever you want and I need to unpress the cups.
Help! What length bottom bracket cartridge do I need to fit my cruiser there are too many lengths. The cruisers bottom bracket without the cups is about 70mm
The length is dictated by the crank set. Look at the specs for your crank set.
Why convert? Those one piece setups are solid and more reliable.
Where did you bought adapter sir?
If 3 piece was the older type, and one piece was the newer type, would people want to upgrade to a one piece?
Brilliant! I never knew. Thanks for another great video.
The adapters probably added the 3mm you needed just saying
Oooh, maybe I can fix my old huffy problems now.
wow what an upgrade. from really old and garbage to just old garbage..
so the side where the bolts slide in goes on the left side wile the one with the matching threads go on the right?
Can you share the link for the Adaptor? Thanks !!
top legal tem desse mesmo adaptador ai pra central 45.? esse ai deve ser pra centra de 50mm né?
I bought this adapter (www.amazon.com/gp/product/B000VT550K/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1#Ask) and this BB (www.amazon.com/gp/product/B008YUUUIA/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1) but I am having a heck of a time threading the bottom bracket. Is it possible I bought incompatible parts? Fairly new at this. This is for a Schwinn Varsity rebuild.
Those look like the correct parts, as long as you didn't buy the Italian version of the BB. Not sure why you are having problems threading them in. Make sure you installed the adpater parts on the correct sides (they are threaded different). And make sure you are installing the BB parts in the correct sides.
Can I put a one crank on aluminum hybrid bike 17 inch frame
I have a 64mm wide bottom bracket shell (currently a 1 piece) that I would like to convert to a 3 piece crank (square or external, not sure yet!!!). Would I try to install the spacers at the adaptor level or when I install the actual BB?
Just trying to figure out if I am trying to fit a square peg in a round whole, but this is a bit of nostalgia project.
Just like I did in the video.
Why would anyone want a 3 piece crank?? Not me.
This may be a silly question, but wouldn't you want the adaptor with the left hand thread to go on the left (non-drive) side of the bike? My logic tells me that when you are pedaling, you would want effectively be tightening the parts rather than loosening them. Other than that, your video was very helpful!
thank u for the info friend. i have a old huffy single speed bike that im converting to 3 speed & this is a perfect upgrade for me. seeya later
Ducenucom
I have an old Huffy 3 speed, that's currently converted to a single speed, as my daily rider. I love it!