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1979 GS750L fork diameter?

  • Thread starter Thread starter NBraun
  • Start date Start date
N

NBraun

Guest
Just a quick question here...

Everything i find says that my forks should be 35mm, but i can't find any spec's released from Suzuki saying what diameter they are, but when i measured them they're actually 37mm. What size should my forks be? Is 37mm correct?
 
NBraun said:
Just a quick question here...

Everything i find says that my forks should be 35mm, but i can't find any spec's released from Suzuki saying what diameter they are, but when i measured them they're actually 37mm. What size should my forks be? Is 37mm correct?
Click to expand...

They should be 35mm. What are you using to measure them with. Also could be the forks were changed on the bike?
 
Im using a digital caliper. They very well could be switch out. The bike has some different things on there, and everyone says i have an L but i had some E parts too. All i know for sure is that the forks have the "axle ears" on them.
 
Some of the early non-L models had those as well. They are called leading axle front forks, btw.
 
If I'm not mistaken, these are the GS750's that have 35mm forks.

35 Suzuki GS-750 B/C/EC (77-78)
35 Suzuki GS-750 EX/EZ (81-82)
35 Suzuki GS-750 LT/LX (80-81)
35 Suzuki GS-750 TZ/TD (82-83)

These are the GS750's with 37mm forks.

37 Suzuki GS-750 ED/ESD (83)
37 Suzuki GS-750 LN (79)
37 Suzuki GS-750 SD "Katana" (83)


This list shows the 79 GS750 as having 37mm forks.
 
The 79 GS750L has 37mm leading axle forks. The E models had 35mm standard forks.
 
Am I measuring my forks correctly? I have a 80 gs750e and I take the caliper and basically measure the outside diameter of the fork and it seems to measure 32-33mm? Am I doing this right?
 
You need to measure the polished part above the dust boots that runs up to the triple tree clamps. I believe the 1980 750 had 37mm, but i'm not positive.
 
If you look at the arrows on the picture attached I basically sqweezed the caliper around the tube and it shows 32-33mm. I've never used a caliper, but I'm pretty sure thats how I do it.
 
Thats definately the right place to measure, but i don't know why you are getting only 32-33mm. Unless someone has swapped to much smaller forks. of course that would require several other things to be changed ( triple tree, etc...).
 
That's strange because it looks like all the front end parts have never been removed. I guess I will stick with them since its what I have. Before I started buying new parts I wanted to make sure I had the right ones.
 
This might sound stupid, but did you make sure your calipers are reading zero when closed. I've made that mistake before. Perhaps someone else will chime in that may know more.
 
Yeah, it sounds like you may be reading your calipers incorrectly. I don't know what kind you have, but on some models there is a line for ID and a line for OD. You might be reading at the wrong line.

You should get a pretty exact measurement, too -- not "32-33mm", but something close to dead-on, like 35.01mm.

Harbor Freight in Castleton has a nice set of digital calipers that read directly in mm for $10-$15.

Also, there are lots of GS-ers in the Indy area. Holler if you need a hand! :D
 
If you look at the attached picture it looks to measure 32mm. I know thus isn't an electronic caliper, but I wouldn't think it would be 3 mm off. Am I not measuring it correctly? Am I supposed to look at where zero lines up or the edge?
 
I just realized I'm an idiot and I was reading it incorrectly. I now notice that the left 0 is offset so when you look at the measurement on the right you look at it based on 0 to the right and I was looking at the edge. Live n learn
 
Thanks, first time using calipers. As soon as I posed the picture it clicked for some reason. Duh!
 
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