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Discussion in 'Japanese polycylindered adventure bikes' started by Greg the pole, Aug 7, 2019.
There is a cool test on youtube of old AT vs new AT.Fun to watch.
Worth a try.
I would be guessing threads would be a 1mm pitch. It is common to pretty much all tubes.
The more I think about it, I don't think there is thread in the Ohlins axle lugs for AT. This would make it an easier swap. Thread the lower portion to accept SSS rebound adjuster. Potentially just screw lugs on to SSS chrome. The mind does ponder!!!
This is a answer italian company rbracing make this, but i tried write tm, but they not answer.
I have tried a few times. Seem to be not interested.
I asked a shop which makes suspension parts what would be the cost of custom made lugs and upper triple clamp to adapt WP USD 48 forks.
They would need at least one week to design, machine programming and machining the first prototype. And that is the best case scenario and everything works at first.
Not that they are not interested but that they should make a few hundred sets to make it cost effective.
The extra length would need to be compensated for, strength would need to be considered, but what about getting an adapter made. To thread properly into the lug, the lower threading into the adapter. Could be made cheaply and locally in most areas.
An internet pic for reference.
Couldn't another company pay the Italian company for the design to save themselves R&D if they wanted to sell a conversion kit? Someone in the US or Australia, presumably. Sure suspension shops make decent money fixing AT forks and selling Ohlins, but imagine being the only shop that is pumping out ATs with REAL FORKS!
Following the fork problems for a while now, however just as a bystander, not owning an AT. Recently I wondered, if I had an AT, with worn forks, I would surely install something more reliable, and forget the thing for ever. And as I see, a lot of peope here thinking similarly. Next question: considering the number of AT-s on the road, how is it possible that no company jumped on the case, and produced a conversion kit? To be honest, as mechanical engineer, with access to CNC machinery, I would do it for myself. My daily job is to design and manufacture more complicated things than a pair of stanchions and a triple tree... So how the hell none of the motorcyle specialists didn't do it already?
Three things that are good, and old:
-mother in laws
keep in mind that the oooohs are top adjustable only. No access to the bottom of legs
here's the pics I was looking for
I do know a guy locally that works at an aircraft shop, as a machinist. It would be a big ask, but I will ask.
if you're going WP, why not go with a whole front end? The forks would slight right into the triples of the AT.
Not fork related, but super neat vid on how this thing came to life...
The lower triple fits, the upper doesn't. It's 1mm thinner than the AT.
But the real problem is at the bottom. The different width of the fork legs in the AT and the 640/990 ones I have, make any possible combination of wheel/rotors/brakes/axle, non compatible.
That is pretty cool.
right, I wasn't sure which triple you were using.
the funny thing is about the OEMs is they are the right thickness diameter near the triples, but taper way down
Good and bad. Would need to drill, thread to accept any other fork internals.
What is the magic that makes the SSS forks so coveted? I have never used them so I'm ignorant in this area.
I would be more concerned that they are made for much lighter dirt bikes and may flex as well with our heavy ATs.
When there was a shortage of Ohlins forks, it was because their supplier for the stanchions (or maybe the outer tube) backed out of renewing their contract as it was hard to manufacture the material required, size and tolerances required. Maybe the SSS forks, having to support the stress of jumps and stuff that the dirt bike guys do, are fine.... but it perplexes me why Ohlins had so much trouble designing a fork for the bike when other stuff would work fine.
for the compression adjustment, and cartridge bolt ya?
I don't think they put the time into it. Their road/race stuff probably sells in much higher numbers, and makes them more money.
They spent the morning designing the fork, went for lunch, an afternoon nap, then forgot they had to sign off on the design, so they threw in a rubber damper, signed off on the design drawings and apporved them for manufacture.
Then they went for a beer. Job done!