Rear Sprocket Dimensions

[Roux]

Can someone help me with the dimensions of a GSXR1000 rear sprocket. Or if there is some another sprocket dimension that is better for our aplication, go ahead and propose that too so I can learn.

I am getting ready to machine the hub that the sprocket bolts to. And I have not bought a sprocket yet. I need to know what the hub OD is, or the sprocket ID will also do. I plan to machine a step in the Diff input flange to center the sprocket properly. I also need the Bolt Circle information. Number of holes, hole size and PCD. If someone has any of this for a GSXR1000 then I would start there. My thinking is that when I order sprocket sets it might be easier to order a sprocket set for the 2007 1000 GSXR and just have to furnish the tooth counts. Instead of confusing the issue by order a Suzi front sprocket and say a Cagiva rear...

[S Lathrop]

Design youu own thing or use something that makes sense for you. Try the Taylor Diff patern. But after that see these guys http://www.sprocketspecialists.com/. They will make what ever you want and it will be way less that a Hewland gear set.

[RussMcB]

I immediately thought of Sprocket Specialists, too.

If you are not in a rush, get a sprocket off ebay, or go to a GSXR internet forum and find someone in your area with one laying around. There may be plenty within a 5-10 mile radius of you. It might be a challenge to find them. :-).

[4wheeldrift]

I can get you those measurements for an 01 gsxr 1000 tonite 12/4. Not sure if the 07/08 etc are the same. I will check on that also.

[kakarot]

The GSXR1000 had same sprocket dimensions through its production runs of 01-08
You can also change the chain from 530 to ether 525 or 520. Front sprockets available for purchase.

The rear GSXR1000 sprocket, as from catalog:
ID 120mm
Bolt patter 5x140mm
bolt hole size of 10.5mm

I would recommend to get the proper tooth count sprocket, and measure the ID, the manufacturing of this things is a bit shaky, and usually off. Usually on positive side. Especially the bolt holes.

For my projects, I plan to drill out the holes to 7/16" and use 7/16" bolts to secure the sprocket.

You can probably find something different that you might use. Might be something better for your application.
Which sprocket ID and bolt patter would prefer?
I am usually good at finding OEM production of sprockets that fit some odd configurations.

If you curious, I use JT sproket catalog for reference of size, and usually get sprokets from sproket specialist because they have a larger tooth count. My new project under development uses 12 front and 65 rear sproket, top speed limited to 70MPh. yep another fsae project. Better this time, not 12/45 which made the car extreamly slow.

[Mike Devins]

Depending on your packaging a split sprocket is a real time saver. Sprocket Specialists will split them and also install a set of master links in the sprocket to assure the proper spacing. You will need a 6 bolt pattern if you want to use the "Link Lock".

[Roux]

Thanks for all the ideas and help. I now have the dimensions I need. And a lot of new ideas.

The GSXR has quite a large ID on the sprocket which means it slips over my tripod joint with the belt drive attachment. i guess I coud grind off the welds and remove the belt drive flange but for now I want to make progress. My idea of changing sprockets and chain goes like this. Remove one or two A arm bolts so that the uprgiht can move away from the car enough to pop the tripod out of its joint. Undo the sprocket and slide it and the chain off. Install is the Reverse. Should take only a few minutes more than the split sprocket. It seems simpler.

GSXR it is

Thanks

Steve

[RussMcB]

I like the split sprocket idea, and have heard there is no reliability issue in our use. With a split sprocket, you don't have to remove any of those things. Your car may be different, but on mine I'd definitely want to avoid removing suspension bolts and tripods if possible.