Keiran95 Posted April 23, 2012 Share Posted April 23, 2012 Hellooo, I'm thinking about getting more of an off roasd tyre on my DT125RE but the specifications standard are, Front tyre dimensions: 80/90-21 Rear tyre dimensions: 110/80-18 and the ones i'm thinking about getting are, Front tyre dimensions: 80/100-21 Rear tyre dimensions: 110/100-18 will they fit without them popping off the rim? or is it a big nono - Thanks for reading Link to comment Share on other sites More sharing options...
Moderator Cynic Posted April 23, 2012 Moderator Share Posted April 23, 2012 Your only changing the profile not the actual size of the tyre, it will affect the gearing and will damage the on road handling but they will fit fine, providing there are no current clearance issues. An 80/90 tyre is a tyre that has an 80mm tread area and the tyre height is 90% of the width of the tread ie 72mm. Your replacement will be the same width but 80mm tall, 8mm doesent sound much but you will feel it. The rear will be more, a 88mm high going to 110mm. That will affect performance to the point that it may be worth considering a gearing change to keep the bike lively performance wise. Think of the rear wheel as the last big gear in the transmission and your making it bigger by 20%. Could be worth a tooth off the front to compensate, possibly more when you allow for the extra drag of dirt bias tyres and loss of top speed. Of course it will affect insurance too, esp if handling can be pointed to as the cause of any incident. Link to comment Share on other sites More sharing options...
Keiran95 Posted April 23, 2012 Author Share Posted April 23, 2012 thanks for the quick reply, i wasnt sure how you read the tyre sizes, i think i will stick with my Avon distanzia set Link to comment Share on other sites More sharing options...
Moderator mervin Posted April 23, 2012 Moderator Share Posted April 23, 2012 distempers aint bad , conti,s are good and where a bit cheaper when i did my SLR a couple of years ago Link to comment Share on other sites More sharing options...
Ryan09 Posted April 23, 2012 Share Posted April 23, 2012 I tried a mitas co2 on mine and it was a 120/90/18 and it rubbed on the crap flap! Also raised the seat height by a noticeable amount. I found for good off road tyres you couldnt go wrong with the BF Goodrich Crossengos but they seem pretty hard to find now days, the mich ac10 wasnt too bad either for the rear. For the front i found a mitas ef-08 was my preffered choice but i did do a lot of laning and the tyres meant the bike wasnt great on the road. Link to comment Share on other sites More sharing options...
busyeddie Posted April 24, 2012 Share Posted April 24, 2012 Cant go wrong with an ac10. But you really dont want to be riding more than 15% tarmac on these sorts of tyres. Link to comment Share on other sites More sharing options...
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