Roadholder mudguard bridges

Previously wrote:

Hi Mick,

It's down partly to the width of the yokes. One is 7" centres and the other is a bit wider but I forget the measurement (7 1/4"?). Beware also those for long Roadholders, they're different again.

Jim

Thanks Jim.

I thought there was a difference. Now I know

Cheers Mick

Previously wrote:

All the early roadholders had the fork stanchions on 7" centers. During 1964 AMC, who had by then had shut down the original Norton works and taken over production at one of their own plants, changed the spacing to 7 3/8".

If you look at the early fenders they are pinched in more, and the front fender bracket has "hollows" in it's sides. On the later wider forks the fender bracket was bent up from a flat piece of tin. The early forks have about 4 5/8" between the fork stanchion fender bosses, the later ones about 5". But with the thickness of the various washer/spacers and the bracket itself, a 3.25 tire is about max on the early bikes as there was only about 3.75" to play with in there inside the bracket.

This is information I got from comparing actual parts I have on hand to each other, early and late fenders, brackets and fork clamps and holding a rule and vernier to them.

Thanks Benjamin.

Cheers Mick