• Welcome to the website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Hon. Editor and Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this website.

    If you have previously registered to use this forum, you should log in now. CLICK HERE.

    If you have never registered to use this website before, please CLICK HERE.

wheels & tyres

derek

Well Known and Active Website User
VOC Member
I have decided to fit road rider universal tyres to my Comet, which has 19" rims , I think wm2 both front and back? How do I check wether wm1 or wm2, is it the width of rim?
What would be acceptable sizes, I have been told front 90/90 & rear 100/90, what do these figures mean?, and are they the best ratio:
 

b'knighted

Well Known and Active Website User
VOC Member
As I understand it, or maybe misunderstand it, the figures are width in mm/height in percentage of width so 90/90 would be 90 mm wide but only 81mm high, 100/90 would be 100mm wide and 90mm high. Take into account that a lower profile will alter gearing to some extent and while I would worry about this on the back you should be aware of the increased inaccuracy of the speedo. I believe they were accurate with a 3.00x21 and a little optimistic with a standard 3.00x20 as its circumference has dropped by more than 3 inches. It was generally said that fitting a 19" front had little detrimental effect on accuracy as a slightly wider 19" tyre would have about the same rolling circumference. This will not be true with a low profile as the circumference will drop by another 2 inches. This will make it out by one in forty - should we worry?
 

derek

Well Known and Active Website User
VOC Member
I have now found the answer.
Rims. WM1 = 1.60" WM2 = 1.85" WM3 = 2.15"
However, you can use a 1.85" rim were 2.15" is recomended and a 1.60" were a 1.85" is recomended.:)
 

Latest Forum Threads

Can't Find What You Need?

Buyer Beware: Fake or Real?

Top