Question about triple tree alignment

DiabloADV · 06-09-2012, 05:39 PM

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.

Cogswell · 06-09-2012, 06:08 PM

If it doesn't line up properly it will put your tubes in a bind.

Mike

DiabloADV · 06-09-2012, 07:01 PM

That's what I thought. I emailed the vendor to try and figure out what triples I have.

pommie john · 06-09-2012, 07:28 PM

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

hardwaregrrl · 06-10-2012, 05:34 PM

Quote:

Originally Posted by pommie john

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!

DiabloADV · 06-10-2012, 06:15 PM

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.

pommie john · 06-10-2012, 10:47 PM

Quote:

Originally Posted by hardwaregrrl

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.

06-09-2012, 05:39 PM	#1
DiabloADV ^OP Semi-Occasional Joined: Oct 2010 Location: Nor Cal, USA Oddometer: 1,534	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. __________________ '74/'70 R98/6/GS Traveling Bike (construction under way) '91 Bill Holland Steel w/Dura Ace

06-09-2012, 06:08 PM	#2
Cogswell Spudly Adventurer Joined: Jan 2005 Location: Riding with my pal Richard Cranium Oddometer: 3,254	If it doesn't line up properly it will put your tubes in a bind. Mike __________________ Cogswell Rides To Big Bend See my airhead project here Time Warp Vintage Motorcycle Club The good thing is, your damn motor can't read. If it says oil on the container, it's pretty much OK to dump in there.... ED.

06-09-2012, 07:01 PM	#3
DiabloADV ^OP Semi-Occasional Joined: Oct 2010 Location: Nor Cal, USA Oddometer: 1,534	That's what I thought. I emailed the vendor to try and figure out what triples I have. __________________ '74/'70 R98/6/GS Traveling Bike (construction under way) '91 Bill Holland Steel w/Dura Ace

06-09-2012, 07:28 PM	#4
pommie john Beastly Adventurer Joined: Apr 2008 Location: Brisvegas, Australia Oddometer: 1,116	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 __________________ The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. Bertrand Russell

06-10-2012, 06:15 PM	#6
DiabloADV ^OP Semi-Occasional Joined: Oct 2010 Location: Nor Cal, USA Oddometer: 1,534	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. __________________ '74/'70 R98/6/GS Traveling Bike (construction under way) '91 Bill Holland Steel w/Dura Ace

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: .
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode