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Author Topic: Comstars + gsx-r front end  (Read 12392 times)

Online irk miller

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Re: Comstars + gsx-r front end
« Reply #10 on: Jun 17, 2017, 23:03:02 »
What I've done is go somewhere like Motion Industries and found a bearing with the right OD and ID and swap them out. When there wasn't a bearing option, then I've made a tension bushing to slide over the smaller diameter axle to fit the larger diameter forks.

Offline rs_ss350

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Re: Comstars + gsx-r front end
« Reply #11 on: Jun 18, 2017, 00:05:06 »
ah - tension bushing - that's interesting! so they'd go in the wider diameter fork "clamps", while the rest (axle, bearings) is oem.   you got a picture of it installed i could use for reference?  still learning here..  :-[
1979 CB750K - 10th Anniversary Limited Edition
1982 CB750K - Cafe/brat project under construction
1977 CB750K - another project!

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Re: Comstars + gsx-r front end
« Reply #12 on: Jun 18, 2017, 00:33:54 »
I don't have a pic installed where you can get a great look.  This is what the bushing looks like:


I was putting a KZ750 front end on a Honda CB750 while using GPZ rims.  If you look close, you can see the sleeve in there.









Offline crazypj

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Re: Comstars + gsx-r front end
« Reply #13 on: Jun 19, 2017, 22:32:29 »
I made alloy 'bushing' for Neevo to fit GSX-R forks with stock CB400 front wheel. Probably safer to bush the fork legs and use a GSX***F front axle (15mm) I used Katana 600/750 axle. The bigger issue, how much shorter than the stock forks are GSX-R forks? Usually, it's around 2"~4" difference which will really mess things up (unless you lower rear to match but then you run out of ground clearance real quick)
« Last Edit: Jun 19, 2017, 22:36:02 by crazypj »
'you can take my word for it or argue until you find out I'm right'
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CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline rs_ss350

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Re: Comstars + gsx-r front end
« Reply #14 on: Jun 19, 2017, 22:59:43 »
thank you!

So the Comstar bearing has 42mm OD and 15mm ID, with 13mm width.  The GSX axle is 25mm ID, so I found an All Balls bearing that's 42mm OD, 25mm ID, but it's 9mm wide.  Will the narrower width be a concern in terms of performance/wear-tear?  And if not a concern, I assume the spacer inside the hub will need to be 8mm wider to make up for the space difference, then we should be all good? 

« Last Edit: Jun 20, 2017, 01:48:25 by rs_ss350 »
1979 CB750K - 10th Anniversary Limited Edition
1982 CB750K - Cafe/brat project under construction
1977 CB750K - another project!

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Re: Comstars + gsx-r front end
« Reply #15 on: Jun 19, 2017, 23:40:25 »
I wouldn't worry about the 4mm difference.  And yeah, you'll need the spacer to make up the difference.

Offline crazypj

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Re: Comstars + gsx-r front end
« Reply #16 on: Jun 20, 2017, 13:33:44 »
That's a nice easy way to do it, those bearings may not have been available a few years ago?
 Do you have spec for load ratings, etc. (although  I doubt you'll exceed limits?)
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline rs_ss350

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Re: Comstars + gsx-r front end
« Reply #17 on: Jun 21, 2017, 00:05:43 »
http://www.allballsracing.com/6905-2RS.html

There's no specs out there on the site. But thanks for confirming this will work along with the spacer. Now for the spacer, I assume I'd want the ID of the spacer slightly larger that the axle? How many mm clearance should there be?
1979 CB750K - 10th Anniversary Limited Edition
1982 CB750K - Cafe/brat project under construction
1977 CB750K - another project!

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Re: Comstars + gsx-r front end
« Reply #18 on: Jun 21, 2017, 00:20:58 »
You want a slide fit.  Not tight, but not loose either.  Essentially, OD of axle should match ID of spacer.

Offline Cookie

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Re: Comstars + gsx-r front end
« Reply #19 on: Jun 21, 2017, 08:47:57 »
I'm following this: I've wondered similar things myself
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81 CB750C
84 Tempter - well, most of it...