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Old 06-09-2012, 05:39 PM   #1
DiabloADV OP
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Question about triple tree alignment

My R90/6 has what we think are XR600R forks and triples. The top tree has stripped threads, so I ordered a nifty billet one:

http://www.rswracing.com/xr600r.htm

But this part has about 3mm more offset than the one on my bike. The fork and stem holes are the right size, and the right distance side-to-side, but the fork holes are ~3mm farther forward than mine.

Am I right in assuming I can't use this? It doesn't line up with the bottom triple, and that would cause bad stresses if I tried to use it, correct?

If that's the case, I'll have to return it.
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1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1970 R60/5
1981 R80G/S Renovation under way. For sale Spring '14
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Old 06-09-2012, 06:08 PM   #2
Cogswell
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If it doesn't line up properly it will put your tubes in a bind.


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Old 06-09-2012, 07:01 PM   #3
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That's what I thought. I emailed the vendor to try and figure out what triples I have.
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1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1970 R60/5
1981 R80G/S Renovation under way. For sale Spring '14
'91 Bill Holland Steel w/Dura Ace

'01 Z3 3.0 Coupe. The Clownshoe.
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Old 06-09-2012, 07:28 PM   #4
pommie john
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If you're prepared to spend a bit more money you could get it fixed.

I had the same problem with an old Honda I'm restoring, I bought a top triple clamp off ebay and it was from the same model, but a different year and the offset was 4mm different.
I took it to a good machine shop and they bored the centre hole bigger , but offset by 4mm and then made a sleeve to take it down to the original size.
Worked a treat and cost $50
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Old 06-10-2012, 05:34 PM   #5
hardwaregrrl
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Quote:
Originally Posted by pommie john View Post
I took it to a good machine shop and they bored the centre hole bigger , but offset by 4mm and then made a sleeve to take it down to the original size.
Worked a treat and cost $50
Man! That must've been a while ago, machine shops in the us routinely charge $150 an hour!
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Old 06-10-2012, 06:15 PM   #6
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I've now figured out that I have triples from a late-80's CR125R (before they went to USD forks on those). They have less offset than the XR600R, but same fork and stem sizes. Plenty listed on Ebay...if I can't find a nifty milled one, I'll get a used cast one and clean it up.

Those CR125's used the same forks as an XR600R.
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1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1970 R60/5
1981 R80G/S Renovation under way. For sale Spring '14
'91 Bill Holland Steel w/Dura Ace

'01 Z3 3.0 Coupe. The Clownshoe.
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Old 06-10-2012, 10:47 PM   #7
pommie john
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Quote:
Originally Posted by hardwaregrrl View Post
Man! That must've been a while ago, machine shops in the us routinely charge $150 an hour!
Last month!

The guy who did it used to spanner for Phil Read and always helps out racers.
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