120/70 on a 620ie?

Dukedesmo · 05-03-2021, 12:57 PM

Same sized wheel as other bikes so why not the tyre?

I recall back in the 916 and 748 days, the bikes used the same frame, suspension, wheels etc. yet 748s were fitted with a 60 profile front whilst 916 a 70 profile, similarly, at the rear 748 had a 180 width whilst 916 a 190 width.

It wasn't long before most adopted the 70 profile front and 180 width rear for both, my understanding was that they tried to sell the 748 as a more nimble bike (presumably to compensate for less power?) and fitting a lower profile front and narrower rear made it tip into a corner quicker but it soon became apparent that it ran out of front tyre/grip sooner due to the lower profile. The narrower rear, however was a good thing.

05-03-2021, 12:57 PM	#5
Dukedesmo Registered User Join Date: Sep 2010 Location: Leics Bike: M900 Posts: 2,844	Same sized wheel as other bikes so why not the tyre? I recall back in the 916 and 748 days, the bikes used the same frame, suspension, wheels etc. yet 748s were fitted with a 60 profile front whilst 916 a 70 profile, similarly, at the rear 748 had a 180 width whilst 916 a 190 width. It wasn't long before most adopted the 70 profile front and 180 width rear for both, my understanding was that they tried to sell the 748 as a more nimble bike (presumably to compensate for less power?) and fitting a lower profile front and narrower rear made it tip into a corner quicker but it soon became apparent that it ran out of front tyre/grip sooner due to the lower profile. The narrower rear, however was a good thing. __________________ M900, 916, LeMans II.