bigbird2 Posted October 19, 2020 Report Share Posted October 19, 2020 I have a sort of home made trials bike that has limited rear tire clearance. So my question is which of the nice sticky 18 trials tires is the narrowest in overall section width? THANKS for any help. Quote Link to comment Share on other sites More sharing options...
mung Posted October 20, 2020 Report Share Posted October 20, 2020 Official competition trials tires are very specific in the dimensions allowed. 400-18 and 2.75-21 are what is allowed. You might want to check out "trail" trials type tires because more sizes are available because there are no restrictions. 1 Quote Link to comment Share on other sites More sharing options...
petert Posted October 20, 2020 Report Share Posted October 20, 2020 Might be a bit harder to find, but a 350x18 used to availble Quote Link to comment Share on other sites More sharing options...
dan williams Posted October 20, 2020 Report Share Posted October 20, 2020 Looks like Mitas or Duro from what I can find. Are they gonna stick like a proper modern tire? Highly unlikely but then again you probably won’t know the difference.? Quote Link to comment Share on other sites More sharing options...
cleanorbust Posted October 21, 2020 Report Share Posted October 21, 2020 15 hours ago, petert said: Might be a bit harder to find, but a 350x18 used to availble Yes, various 3.50 x 18 trials tyres on eBay. May not work too well in the sections but might solve the problem. Quote Link to comment Share on other sites More sharing options...
motovita Posted October 21, 2020 Report Share Posted October 21, 2020 The 4.00R-18 rear tire is the most important component of a Trials bike. Try to modify your bike to accept one. Quote Link to comment Share on other sites More sharing options...
htrdoug Posted October 22, 2020 Report Share Posted October 22, 2020 The CST Legion I tried was narrower than Dunlops and Mich,but I’d say it had the traction of a overinflated tire and squired like a under inflated one...but likely better than a bargain dual sport trials tire. Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted October 23, 2020 Report Share Posted October 23, 2020 Measurements just taken Dunlop 803 120/100, used, 0.25 bar on WM2 rim, 108mm at the widest point Dunlop 803 120/100, new, not mounted, 109mm Michelin Comp 400-18, used, not mounted, 110mm (tube type) Mitas Trial 400-18, new, not mounted, 113mm (tube type) IRC TR11 400-18, New, 0,3bar on WM3 rim, 108mm (tube type) Michelin X-lite 120/100, 0,3bar on WM3 rim, 110mm Not much difference. I think Mitas is not ment for serious trials riding. Michelin, IRC and Dunlop are doing well. I think Motovita is correct. Try to modify your bike to accept real trial tyres. Tubeless fits any rim if you use Tubeliss Current tube at my 199A is the first one. No problem at all with Tubeliss Quote Link to comment Share on other sites More sharing options...
motovita Posted October 23, 2020 Report Share Posted October 23, 2020 3 hours ago, carl ekblom said: Measurements just taken Dunlop 803 120/100, used, 0.25 bar on WM2 rim, 108mm at the widest point Dunlop 803 120/100, new, not mounted, 109mm Michelin Comp 400-18, used, not mounted, 110mm (tube type) Mitas Trial 400-18, new, not mounted, 113mm (tube type) IRC TR11 400-18, New, 0,3bar on WM3 rim, 108mm (tube type) Michelin X-lite 120/100, 0,3bar on WM3 rim, 110mm Not much difference. I think Mitas is not ment for serious trials riding. Michelin, IRC and Dunlop are doing well. I think Motovita is correct. Try to modify your bike to accept real trial tyres. Tubeless fits any rim if you use Tubeliss Current tube at my 199A is the first one. No problem at all with Tubeliss It sounds like you're successfully using the Tubliss system on the original 1.85X18 Akront rim on your Bultaco, is that correct? Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted October 23, 2020 Report Share Posted October 23, 2020 Yes, 1.85x18 Akront. Can be little difficult to mount the tyre (or remove) but works well. Before had problem with the tube wandering inside the tyre. Now works perfect with Dunlop 120/100x18 tubeless tyre Quote Link to comment Share on other sites More sharing options...
bigbird2 Posted October 23, 2020 Author Report Share Posted October 23, 2020 Thanks for all the good info folks. I've decided to try the Michelin X11 and think/hope I can squeeze it in. I have one on my Beta 200 and it is good! So I have a 2:15 X18 rim and spokes are ordered The bike I'm trying to fit it to now is a Luna Sur-Ron eMC. I love it as it is so light and I have made quite a few mods - 21" front wheel with knobby and 3:50 19" Mitas ~trials on wider rim on back, foot pegs lower and farther back and handle bar higher and farther forward. The light weight "eStart" and smallish size are great for the 77 year OLD guy for the gnarly trail riding I likw and I'll probably try it at a Trials event. Quote Link to comment Share on other sites More sharing options...
motovita Posted October 23, 2020 Report Share Posted October 23, 2020 4 hours ago, carl ekblom said: Yes, 1.85x18 Akront. Can be little difficult to mount the tyre (or remove) but works well. Before had problem with the tube wandering inside the tyre. Now works perfect with Dunlop 120/100x18 tubeless tyre That's good to know, I suppose the real challenge is to find an Akront rim that's still straight enough to work with the Tubliss system. Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted October 24, 2020 Report Share Posted October 24, 2020 The air seal is between the small Tubeliss tube and the tyre so I think they accept a lot from the rim. I think much can be done to an old Akront rim to restore it to an acceptable condidtion but new spokes may be needed Beside that, Morad is clamed to be Akront copies but I have no experience. Quote Link to comment Share on other sites More sharing options...
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