Info on 1998 r1 usd forks ASAP!!!

steven_191 · Nearly there... Joined: 31 May 2009 Karma :

Not that ASAP really. eBay auction ending later today and I need to know the diameter of the forks where they fit into the yokes.

I'm sure some clever folk on here know the answer. All help appreciated

Thanks

By the way I'm hoping you say 50mm top and 54mm bottom.

Bezzer · World Chat Champion Joined: 14 Apr 2005 Karma :

steven_191 · Nearly there... Joined: 31 May 2009 Karma :

Are you saying they are 50/54 or are you doing what I expected someone to do and just say that??

These aren't actually for an r1. It's for a project. Just considering as they're cheaP

Bezzer · World Chat Champion Joined: 14 Apr 2005 Karma :

Fizzer Thou · World Chat Champion Joined: 06 Aug 2011 Karma :

I have just checked the fork dimensions on my 2001 R1 and the upper diameter is 50mm and the lower is 55mm.
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steven_191 · Nearly there... Joined: 31 May 2009 Karma :

Amazing. This could work out well then. Now I just need to be sure I can get lighter springs and should all be gravy

Fizzer Thou · World Chat Champion Joined: 06 Aug 2011 Karma :

I recently performed an upgrade on a friend's '99 R1 where I installed some 0.95kg springs from K-Tech as the OEM ones are too soft.This,together with new seals and 7.5w fork oil from Motul made a big differance to the handling of his bike using the standard air gap.
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Just talk bikes.What else is there?

Always have a 'Plan B'

steven_191 · Nearly there... Joined: 31 May 2009 Karma :

I'm hoping for the project to come in at less than 140kg.

I'm going to look for k-tech now. I don't know enough about suspension to be able to make the right decisions on what I need in terms of springs and rates etc. All I know is that when its all together I'm going to weight it. Thumbs Up

Well they do springs between 8.5 - 10.5n which I guess is newtons? Who knows. Hopefully it'll work lol

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

I read in a mag somewhere that 1998 R1 forks have loads of extra travel to try to reign in the huge tendency to wheelie of the original R1 and consequently don't give the best handling in the world...

Obviously I'm not speaking from experience but it is something to consider nonetheless.
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steven_191 · Nearly there... Joined: 31 May 2009 Karma :

But they've still got to beat cagivas one side damping and one side rebound with a single spring.

Still, complete front end for £250 I don't think is too bad. Its got those blue spot calipers and everything except a mud guard

steven_191 · Nearly there... Joined: 31 May 2009 Karma :

Just so you know the r1 forks are definitely 50 and 54mm top and bottom. They slot straight in and bolt up to the cagiva yokes. Unfortunately the width is different so I'll be getting the stems out of each bottom yoke in order to fit the cagiva one into the r1 yoke. Should work out quite nicely.

I'm guessing I'll probably need to weld in a sleeve on the bottom of the stem to fit into the r1 yoke as its generally bigger all around. This should take up the slack.