I have an 07 YZ450F and a friend of mine had a new set of brand new Bridgestone M404 and 403 that he want to sell so I bought them.

The only problem is the rear is a 110/80/19, instead of a 110/90/19. Is this a big deal?

I'm a novice level senior motocross rider. Hate that word "senior":ride:

The 110/80 is intended for 1.85" rims such as those found on the YZ250F, and is technically too small a tire for your bike. It is shorter overall by a small amount, and so might be more susceptible to rim pinches when running in rocks, etc. Could be kind of hard to mount.

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