THANK YOU KING, this is the best explanation of thid topic ive seen so far! Seriously i was losing my mind trying to get a grip on what tires would fit, this helps out a ton, very greatful, thank you for educating us also note: that intro was extremely relatable and funny
Great Video. There is a little more that you didn't cover. 1 - The increased wheel diameter will change the qorque or gearing of the bike slightly. You could do some maths to calculate this. 2 - The stock speedo has been calibrated from the stock diameter tyre. This may change the speedo reading again depending on where the sensor is. Again, some maths required to see if this is significant, although I don't expect so. and finally you did cover that the width and gap to fitment is really important. Actually it may all fit and seem fine. But the larger diameter could foul on body work when you completely bottom the wheels out, say, full gear and hit a large dip that bottoms out your suspension. So maybe some rubbing under the front or rear fender. I haven't done any research to see if that's the case. You will see of hear the evidence of this later on. Overall, thanks for taking us on your (and ours) learning journey.
Excellent, as usual. Thank you for that and other videos. Clear, well prepared, and conveyed in a friendly and humble manner. I finally got explained and understood what that second number means 👍
This was a good explanation! Thanks for doing the math for me on the same sized Shinko 804/805 set I’ve been enjoying. Would like to see the suspension geometry change for this example and you could talk about the theoretical effect as well as how it felt.
the 90/90-21 it will make the fork work at a more closed angle 👍 ( and different feeling ride handling ) compared to stock ( 80/100-21 ) The different rear tyre (compared to stock) can change the "gear ratio" just like a different sprocket (teeth) ciao ! (sorry for my english)
People say the D606 in the front tends to wander, and the MT21 is more precise. I’ve never tried the D606 personally though, I just trusted the general consensus when purchasing this combo.
I may be wrong, but I think a 90/90-21 is narrower than a 100/80-21. You said it is wider. Changing tyre sizes can also effect the accuracy of your speedo which I think runs off the gearbox. On my F650GS BMW my speedo over-read when I had road tyres on. When I put duel sport tyres on with a much deeper tread, it didn't.
The sizing on stock is 80/100, not 100/80. So 90/90 is a bit wider. Also, thanks for the reminder about the tire size affecting the speedo. I really wish I would have mentioned that in the video.
Very good...so the next video I hope to see is these tires on your bike! I have the 120/90 on the rear of my Rally and I also changed the rear sprocket to a 45 tooth (stock is 40)...it was absolutely necessary to re-gear the bike to accommodate the larger tire, otherwise the engine would annoyingly lug at the bottom end of 2nd gear...ride your bike right after you do this swap and you'll see what I mean. I couldn't stand it. 43 teeth will get you back to stock but I wanted even more low end torque...now that "area" between 1st and 2nd gear is perfect, IMO. For people that will ride the bike a lot on the roads in 6th gear at high speeds, go with the 43 tooth if you get the larger tire. Curious to hear your impressions and see what you do in this regard...
@@mtn2008 Most likely - depending on the change. I think going up 5 teeth in the back would probably require a new chain. Might be able to get away with 3 more teeth in the back with the stock chain, but I'm not sure.
I may be wrong but I believe the tires that have the standard inch widths are considered 100% aspect ratio if they are .0 or .5 but low profile if they are .1 or .6 and this detail makes things even murkier lol
Haha, good to know. Though I believe low profile tires are typically radials for street bikes, so I shouldn’t have to clutter my brain with yet one more odd piece of sizing data 😂
CRF takes speed from the rear tyre and I think from the gears so use GPS to know the difference if you change. Studded Winter Tyres on my Rally now 90/80 21 and 110/80 18 I have some videos but not on a ride. Should buy some camera for that. Only filmed with a phone. On my rat custom I use DARK SIDE = car rear tyre.
Yeah, I really should have mentioned in the video that changing the tire size can affect the speedometer. Thanks for the reminder - I’ll add a note about that in the description. And that’s awesome that you’re doing the car tire thing 🙂. I watched F9’s video about that a while ago. Didn’t even know it was possible before that.
@@HighDesertHills it is 3th Dark Side now on that rat chopper. Dark side works just fine. There is even more friction and surface area. But maybe not so good idea with these Rally bikes :) Front wheel on the rat chopper is 90/90 21" Michelin Sirac. And with the Dark Side works great even on the gravel roads. Waiting for the summer for that fun.
THANK YOU KING, this is the best explanation of thid topic ive seen so far!
Seriously i was losing my mind trying to get a grip on what tires would fit, this helps out a ton, very greatful, thank you for educating us
also note: that intro was extremely relatable and funny
Thanks for the great comment!
Thank you for this video, I run into same issue with my CRF 250L and available sizings of tires on the market.
Great Video. There is a little more that you didn't cover. 1 - The increased wheel diameter will change the qorque or gearing of the bike slightly. You could do some maths to calculate this. 2 - The stock speedo has been calibrated from the stock diameter tyre. This may change the speedo reading again depending on where the sensor is. Again, some maths required to see if this is significant, although I don't expect so. and finally you did cover that the width and gap to fitment is really important. Actually it may all fit and seem fine. But the larger diameter could foul on body work when you completely bottom the wheels out, say, full gear and hit a large dip that bottoms out your suspension. So maybe some rubbing under the front or rear fender. I haven't done any research to see if that's the case. You will see of hear the evidence of this later on. Overall, thanks for taking us on your (and ours) learning journey.
Great info, thanks! I'm about ready to replace the rear tire on my 300 Rally too.
Good luck with it!
Excellent video and tutorial Tyler. And good combination on tyres.
And cool shop there. Especially the desert sled.
Thanks Dick! Unfortunately, it’s not my garage behind me - just a green screen with a cool photo.
Great video, lots to think about.
Thanks for the feedback!
Excellent, as usual. Thank you for that and other videos. Clear, well prepared, and conveyed in a friendly and humble manner. I finally got explained and understood what that second number means 👍
Glad it was helpful. For some reason it took a long time for that ratio thing to click with me.
Great video!!! Can't wait to get my 2022 CRF300L!
Thanks! Hope you get your 300L soon!
This was a good explanation! Thanks for doing the math for me on the same sized Shinko 804/805 set I’ve been enjoying. Would like to see the suspension geometry change for this example and you could talk about the theoretical effect as well as how it felt.
Lots of good info here...very helpful. Thank you
Glad it was helpful!
Thanks. Knowing is half the battle.
I had to leave this comment right away . (I love your WTF comment at the beginning ) I just laughed .
Great video
Many variables..for that reason I've just stuck with stock sizing F & R. 👍
Always a smart choice 👍
To stay legal when on the road, the new tire cannot have a lower Weight rating or Speed rating , at least that is the case where I live.
Good Vid
Good point. I don’t believe that’s the case here in Utah, but these tires are rated for both more weight and faster speed than stock 👍
the 90/90-21 it will make the fork work at a more closed angle 👍
( and different feeling ride handling ) compared to stock ( 80/100-21 )
The different rear tyre (compared to stock) can change the "gear ratio" just like a different sprocket (teeth)
ciao ! (sorry for my english)
I’m anxious to try it out. Hopefully once I get these mounted the snow will stop coming down for a few minutes 😂
Well done on a very worthwhile video - what's the reason with the Dunlop rear/Pirelli front rather than dunlops front and rear?
People say the D606 in the front tends to wander, and the MT21 is more precise. I’ve never tried the D606 personally though, I just trusted the general consensus when purchasing this combo.
@@HighDesertHills Thanks for the explanation - good content you're doing here - keep it up!
I may be wrong, but I think a 90/90-21 is narrower than a 100/80-21. You said it is wider. Changing tyre sizes can also effect the accuracy of your speedo which I think runs off the gearbox. On my F650GS BMW my speedo over-read when I had road tyres on. When I put duel sport tyres on with a much deeper tread, it didn't.
The sizing on stock is 80/100, not 100/80. So 90/90 is a bit wider.
Also, thanks for the reminder about the tire size affecting the speedo. I really wish I would have mentioned that in the video.
Very good...so the next video I hope to see is these tires on your bike! I have the 120/90 on the rear of my Rally and I also changed the rear sprocket to a 45 tooth (stock is 40)...it was absolutely necessary to re-gear the bike to accommodate the larger tire, otherwise the engine would annoyingly lug at the bottom end of 2nd gear...ride your bike right after you do this swap and you'll see what I mean. I couldn't stand it. 43 teeth will get you back to stock but I wanted even more low end torque...now that "area" between 1st and 2nd gear is perfect, IMO. For people that will ride the bike a lot on the roads in 6th gear at high speeds, go with the 43 tooth if you get the larger tire. Curious to hear your impressions and see what you do in this regard...
Thanks for the tip! I’ll definitely keep an eye on it when I do the swap. I didn’t even think about that, so I really appreciate the comment 👍
@@mtn2008 Most likely - depending on the change. I think going up 5 teeth in the back would probably require a new chain. Might be able to get away with 3 more teeth in the back with the stock chain, but I'm not sure.
I think you will feel like Graham Jarvis with your new tires ,over the stock IRCs. What is the vintage bike behind you on your left?
Unfortunately, what's behind me is a green screen 😂 I figured a picture of a cool garage would be more interesting to look at than my blank wall.
HIi nice video ? just for info could you just confirm the size of the D606 rear you use !
Thanks - The size I'm using on the D606 is 120/90-18. There's a link in the description if you're looking for one.
I may be wrong but I believe the tires that have the standard inch widths are considered 100% aspect ratio if they are .0 or .5 but low profile if they are .1 or .6 and this detail makes things even murkier lol
Haha, good to know. Though I believe low profile tires are typically radials for street bikes, so I shouldn’t have to clutter my brain with yet one more odd piece of sizing data 😂
Thanks your explanation helped alot.
Glad it helped!
But riders are saying you can use either a 12 or a 14 on a tw200....?
CRF takes speed from the rear tyre and I think from the gears so use GPS to know the difference if you change.
Studded Winter Tyres on my Rally now
90/80 21
and
110/80 18
I have some videos but not on a ride. Should buy some camera for that. Only filmed with a phone.
On my rat custom I use
DARK SIDE = car rear tyre.
Yeah, I really should have mentioned in the video that changing the tire size can affect the speedometer. Thanks for the reminder - I’ll add a note about that in the description.
And that’s awesome that you’re doing the car tire thing 🙂. I watched F9’s video about that a while ago. Didn’t even know it was possible before that.
@@HighDesertHills it is 3th Dark Side now on that rat chopper.
Dark side works just fine. There is even more friction and surface area. But maybe not so good idea with these Rally bikes :)
Front wheel on the rat chopper is 90/90 21" Michelin Sirac. And with the Dark Side works great even on the gravel roads. Waiting for the summer for that fun.
this is the only video you need to understand the stupid math of tyre sizes......would have been great if you talked about rim sizes too
Thanks! And good point about rim sizes.