Britbike forum Forums British Motorcycle specific Brands Bsa bulletin board B441 tires

Forgive my ignorance but tyre sizes have always seemed a black art to me. I want to put some new boots on my '67 B441. The rear has a 4.00 R18 fitted, it is an IRC trials tyre.
Dunlop do a nice looking dual purpose 50/50 D605 but only in 4.10 R18. What the heck is the difference? is the 4.10 significantly wider? Taller? I just cannot make head nor tails of any information in the old interweb

The 4.10 is a low profile tyre, it would have been comparable to the standard profile 3.50. But a little wider and as I say lower profile.

The 3.60 is a low profile version of the 3.25

HTH

Have a look at the Pirelli MT43 (?) tyres, I’ve used this on and off road with no problems