Difference between 1.85/2.15 rim

[Mike_H]

Wow, Talk about complicated. When I did the swap on my 650L, I just bought the front end from a 650G, and Plugged everything in. I ended up using the forks (upper and lower), calipers, and discs from the G and the front wheel, axle, speedo drive, and some spacers (not all) from the L. The wheel was already drilled and tapped for dual discs. The trick to making it all work was the speedo drive. They also act as spacers, and the drive from the G was too wide for my L...Took a couple of days to figure that one out. Anyway, it handles fine, if not a little bit heavier in the steering. That could be due to the extreme change I made in my handlebars though. IMHO I would look for a front end from a 750G, and try the swap with that. You could also look in your service manual...You have one right...and compare specs with someone who has the specs on a 750G. If you don't have one...well PM me...I'll see what I can do for ya.

 

[UncleMike]

Wow, Talk about complicated. When I did the swap on my 650L, I just bought the front end from a 650G, and Plugged everything in. I ended up using the forks (upper and lower), calipers, and discs from the G and the front wheel, axle, speedo drive, and some spacers (not all) from the L. The wheel was already drilled and tapped for dual discs. The trick to making it all work was the speedo drive. They also act as spacers, and the drive from the G was too wide for my L...Took a couple of days to figure that one out. Anyway, it handles fine, if not a little bit heavier in the steering. That could be due to the extreme change I made in my handlebars though. IMHO I would look for a front end from a 750G, and try the swap with that. You could also look in your service manual...You have one right...and compare specs with someone who has the specs on a 750G. If you don't have one...well PM me...I'll see what I can do for ya.

No such thing as a 750G, is there?

 

[UncleMike]

I assume going from 35mm to 37mm forks is desireable from a handling perspective?

 

[KGB]

I assume going from 35mm to 37mm forks is desireable from a handling perspective?

No it will throw your carbs out of synch

You will notice some, minor, not a huge difference in the stiffness
of the front end.


So now what size tire can you run ?
Get rid of that Kenda..............

 

[Billy Ricks]

Mike, if you're going to upgrade anyway why not go for something newer? You could go with an '83 and up 700 or 750E front end that would look correct to the casual observer and they can easily be pulled up or down in the triples if the length needs to be worked with. You'd have the quick 16" front wheel too. I have calipers lying around for one if you need some. They are probably the same as were used 4 or 5 years earlier on the 750's. With all the guys doing upgrades you should be able to pick up a front end cheap whatever you decide to do. I'm going to have an '88 GSXR front end available soon but it would be better on a 550 with a heavier rider.

 

[UncleMike]

No it will throw your carbs out of synch

You will notice some, minor, not a huge difference in the stiffness
of the front end.


So now what size tire can you run ?
Get rid of that Kenda..............

The Kenda is on my spare set that I'm selling from my old 750L. I've got a Dunlop up front on my T.

 

[UncleMike]

Mike, if you're going to upgrade anyway why not go for something newer? You could go with an '83 and up 700 or 750E front end that would look correct to the casual observer and they can easily be pulled up or down in the triples if the length needs to be worked with. You'd have the quick 16" front wheel too. I have calipers lying around for one if you need some. They are probably the same as were used 4 or 5 years earlier on the 750's. With all the guys doing upgrades you should be able to pick up a front end cheap whatever you decide to do. I'm going to have an '88 GSXR front end available soon but it would be better on a 550 with a heavier rider.

I'm not sure that a 16" wheel would look right on the T. I picked up a front end from an '80 1000 on ebay including forks, calipers, triples, signals and fender, with SS lines for $79.

I might just take the SS lines off of that and mount some 750 forks on, so I can keep the 19" front wheel.

 

[Mike_H]

No such thing as a 750G, is there?

Ya. In 81 and 82 they made a 750GL with dual discs. Check the Gallery page. Thought about using a front end from those for my bike, but I think the uppers were bigger diameter than my 650.

 

[UncleMike]

Ya. In 81 and 82 they made a 750GL with dual discs. Check the Gallery page. Thought about using a front end from those for my bike, but I think the uppers were bigger diameter than my 650.

Weird. I could've sworn G = shaft.

 

[8trackmind]

Mike, you're over-thinking this.
The left side is easy. Speedo drives on all models are the same thickness. Done.

Read this to adjust the right side.
http://www.thegsresources.com/_forum/showthread.php?t=87809&highlight=brake+swap
No balance issues, nothing to it. I have at least 4 different years of parts bolted to the front end. No problem.

You know, you may not even have to do anything to the right side spacer.

 

[first timer]

mike i am just going to throw this out there, i have a 81 1100 e front end (leading axle but has offset tripal tree to make up for the leading axle) This front end has damping control and spring preload, any gs wheel will fit on it. it's dual disk too. i also have some tripal trees with the regular offset that will fit these forks, i can throw it in if the forks hit your tank. i just cleaned them out real good and replaced the seals in them so add oil and go. i'll sell cheap.

flame on if you think this is a shamless plug but really i am trying to help.

-ryan

 

[waterman]

"Speedo drives on all models are the same thickness."

I am not so sure that is the case. I am in process of getting parts to fix 650g and have found that the speedometer drives between g and gl models are different in several ways. The thickness is close within 0.012in to each other but the big difference is the outer diameter where it mates with front rim. On my g model the drive fits into the wheel hub, not sure with gl since I don't have one. I presume that the gl drive has a rim that covers the wheel hub. I just realized this yesterday when trying to fit a speedo drive I had purchased from ebay.

I would try to use the speedometer drive that matches the wheel model. In other words, use the one that was with the wheel. A quick comparison check using bikebandit shows that the wheels are a different part number from g to gl in 650 at least. Not sure on other models.

Not sure if this applies in your case but may want to double check setup.