TIRE SIZES?

[axldk6]

ok, installed vape system. worked carbs ( very close now), 100 miles TNT, now for new tires. Question is can I run 100/90 on the front ( 90/90 stock). and 110/90 on the rear (100/90 stock)? 1974 RD 350, with out fitment issues? seems like 10mm should not rub anywhere? have I answered my own question?     

[m in sc]

itll fit but not handle as well.  also the ft tire will be hard to get on and out w the fender

[RDnuTZ]

there was another lengthy discussion about wider front tire recently. Can't remember poster name but he had already mounted wider tire and was looking for a fender to fit.

[axldk6]

well ok then . stock sizes it is, and thanks, this bike is so close to being a daily  

[IR8D8R]

The 100/90 fits. There is adequate clearance between the inward curve of the stock RD350 fender's fork brace using stock rims. Wider rim? It needs to be perfectly true. The wide rim lets the tire open up right where the brace is narrow and the tire is it's widest. There will be about 1.5mm on either side where the little ripple is on the 350 fender mount.

The stainless RD400 front fenders don't have that issue. They look pretty close to stock and you don't need stays.
If you don't run the stock front fender you need a brace. It's built-in to the stock fenders.

Turn in is supposed to be faster with a 90/90 front. I've run 100/90 front on both a stock and a 2.15" wide rim.

Rear 110/80 is better than a 110/90 IMO.

IR8D8R

[m in sc]

depending on the tire the mounting bolts can interfere. 

[1976RD400C]

I don't get why you would use bigger tires when it doesn't really put any more rubber on the road, maybe less the way it fits on a rim that isn't very wide. They certainly don't heat up like a smaller tire would and heat sure helps with grip.   

[2steve]

Speaking from my recent RZ point of view, I ordered a 90/90, but a 100/90 came in. Rather than go through the hassle, I put it on.
It bothers me as it looks a bit too high on the profile. A 100/80 would look pretty good and won't look overdone on the width but when I replace, it will be a 90/90.

[m in sc]

I don't get why you would use bigger tires when it doesn't really put any more rubber on the road, maybe less the way it fits on a rim that isn't very wide. They certainly don't heat up like a smaller tire would and heat sure helps with grip. 

its minimal but yes, technically its less contact area. this can be rectified with tire pressure but 99% of people won't benefit or be hindered because if it. however, you can def feel it, imho due to weight differences and OD. also, all 100 90 18s are not the exact same size, etc. there are variances between makers