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Who builds custom fork tubes??

  • Thread starter Thread starter T8erbug
  • Start date Start date
T

T8erbug

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I have a 1979 gs750 that I have done a 2001 GSXR fork conversion on and I don't like that the bike sits 3" lower in the front now. I haven't reassembled the bike after the fork conversion because I'm sure it will have an adverse effect on handling. Basically I'm thinking the way to go is to find some 45mm fork tubes (same diameter as the GSXR fork tubes) that are 2 1/2" to 3" longer than the stock GSXR forks and then just rebuild them from there. Any recommendations on where I can find custom fork tubes?? Thanks!
 
Some where I read that 929 fork triple top will give added length Don't know for sure. Either way a custom triple would be cheaper than replacing the forks OR a screw in fork extension ???
 
http://www.gpsuspension.com/products/newproducts_detail.php?item=1

15mm probably not enough for your application

http://www.guzzitech.com/store/Forkcap.html

Closer to what your looking for but less than attractive

http://www.cycleoneoff.com/Photo_Album.html
Scroll to bottom for fork extenders. Cheaper but look dangerous.

http://www.lithiummotorsports.com/products.php?product=Ohlins-GSXR-Fork-Extender-Caps-(Suzuki-GSXR)

Go to Google and type in GSXR Fork Extenders I know there are at least several other companies that do extenders and then there are multiple companies that do dropped Yokes like Warpspeed, visit OldSkool Suzuki
 
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Hey thanks for the quick replies! I had NO idea they made fork tube extender caps! That is probably the route I will go due to the ease and options. I have been unable to find anything for the gsxr fork in particular but I think if I can work out thread sizes and what not I will be able to find a match. If not I work with engineering software so I'm sure I can draw something up and have it machined. Just like everything else in life... it just takes money. Thanks again for the help!
 
T8erbug said:
I have a 1979 gs750 that I have done a 2001 GSXR fork conversion on and I don't like that the bike sits 3" lower in the front now. I haven't reassembled the bike after the fork conversion because I'm sure it will have an adverse effect on handling. Basically I'm thinking the way to go is to find some 45mm fork tubes (same diameter as the GSXR fork tubes) that are 2 1/2" to 3" longer than the stock GSXR forks and then just rebuild them from there. Any recommendations on where I can find custom fork tubes?? Thanks!
Click to expand...
I installed GSXR 1100 K RSU forks to a GS 1000 and had the same clearance issue :(
Since then, I decided to extend the fork tubes by 10 cm ( to keep the clip-ons on top of the top yoke) but it has been a painfull experience both in terms of price and difficulty (http://www.thegsresources.com/_forum/showthread.php?t=188127)
You need to also consider the fact that the yokes on the modern Suzukis have much less offset.
In practice this means that the trail will increase quite a bit IF the fork legs are kept as long as the original ones.
More details on this subject here: http://www.thegsresources.com/_forum/showthread.php?t=187018.
And here: http://www.thegsresources.com/_forum/showthread.php?t=187077
The ideal I believe is to keep the front fork as short as possible wrt to ground clearance and lift the rear of the bike with longer shocks to get a rake angle in line with more modern Suzukis:)
 
The 929 triples must use upper and lower

The 929 triples must use upper and lower

The angle on the 929 stuff is at a different rake, so it's necessary to go with the upper, lower, and steering stem. They only work with GSXR 750 forks; I bought the 929 triples, then could not use them, as my GSXR forks are from a 1991 GSXR 1100.
 
Lower the front and raise the rear seems to be what I have been hearing the most. I probably won't extend it quite up to stock height but I do think I will need at least an inch or two. Three seems to be an extreme I fear will be a bit crazy when I try to tune everything to the new set up. Plus while cornering I want to make sure I'm high enough all around to clear the crank cases. Ha I don't want to lever the rear wheel off the ground and high side... yikes. My biggest fear is creating a bike with worse handling than it initially had ha. I did some math and took some measurements and the offset on the new forks actually helps quite a bit. The new forks alone would have decreased rake quite a bit but the yoke offset helps put it back closish to where it was before. Thanks again so much for the help guys! I LOVE this forum
 
The larger dia. USD forks like the 92-95 GSXR1100 have less movement up and down than smaller dia. RSU forks, especially with stiffer springs installed.

So if your original forks provided 5.5 inches of clearance under the header you may be able to live (no pun intended) with less clearance (say 4"). This is mainly true for straight up and down approaches to speed bumps, pot holes and such.

Touching your outer cases, case guards and toes down in sharp corners won't be helped as much by this benefit with USD forks.
 
isleoman said:
The larger dia. USD forks like the 92-95 GSXR1100 have less movement up and down than smaller dia. RSU forks, especially with stiffer springs installed.

So if your original forks provided 5.5 inches of clearance under the header you may be able to live (no pun intended) with less clearance (say 4"). This is mainly true for straight up and down approaches to speed bumps, pot holes and such.

Touching your outer cases, case guards and toes down in sharp corners won't be helped as much by this benefit with USD forks.
Click to expand...


My forks are actually from a 600GSXR so they are still RSD (I wanted to keep the look of the old skewl) BUT what you are saying still rings true because I'm pretty sure travel is still considerably less on the forks I have. I guess the only way to find out is just to get out and ride it. . and hopefully I can LIVE with the modifications made (pun cheesily intended haha). If it handles wierd I think cap extenders will do the trick
 
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