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Author Topic: Comstars + gsx-r front end  (Read 14266 times)

Offline rs_ss350

  • Posts: 88
Re: Comstars + gsx-r front end
« Reply #40 on: Jun 22, 2017, 14:19:38 »
THat's similar to what I'm trying to do for mine:


I suppose i could just get the spacer machined without the holes, then use the rotor as a template as you did.

Then in order to properly clock the new rotor, I'd want to make the adapter first -  Then clamp the pieces together somehow in order to keep everything from rotating throughout the drilling process?

1979 CB750K - 10th Anniversary Limited Edition
1982 CB750K - Cafe/brat project under construction
1977 CB750K - another project!

Member of Moto Guild SF

Offline irk miller

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Re: Comstars + gsx-r front end
« Reply #41 on: Jun 22, 2017, 14:24:27 »
If you are sending the spacer out to be machined by someone else, then get them to do the holes.  Any shop with a CNC just needs to know the diameter of the pattern and the amount of holes. Then use the spacer to measure up your rotor.

Offline rs_ss350

  • Posts: 88
Re: Comstars + gsx-r front end
« Reply #42 on: Jun 22, 2017, 15:11:34 »
Makes sense... what's the best way to measure the diameter of the pattern - do you measure from the ID of the entire piece to the edge of the hole, or center to center?
1979 CB750K - 10th Anniversary Limited Edition
1982 CB750K - Cafe/brat project under construction
1977 CB750K - another project!

Member of Moto Guild SF

Offline irk miller

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Re: Comstars + gsx-r front end
« Reply #43 on: Jun 22, 2017, 16:01:03 »


The one on the left.

Offline erock85

  • Posts: 114
Re: Comstars + gsx-r front end
« Reply #44 on: Jun 22, 2017, 16:45:43 »
Makes sense... what's the best way to measure the diameter of the pattern - do you measure from the ID of the entire piece to the edge of the hole, or center to center?
What rotors are you using? The pitch circle diameter(PCD) for the comstar bolts is as follows: ⌀78mm (5)⌀8.5mm. The center hole or rotor carrier flange is ⌀58mm
« Last Edit: Jun 22, 2017, 16:48:21 by erock85 »
1974 Honda CB360
1979 Honda CX500
2005 Harley Davidson Sportster 883

Offline irk miller

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Re: Comstars + gsx-r front end
« Reply #45 on: Jun 22, 2017, 17:23:45 »
What OD on these?  Metalgear shows a rotor with 78mm dia 5 bolt pattern with 296mm rotors.  You might be able to make those work, if you can figure out what bike they're off of.  There might be something else for a different dim.

http://www.metalgear.com.au/mgear-brake-disc-front-p-6786.html

Offline erock85

  • Posts: 114
Re: Comstars + gsx-r front end
« Reply #46 on: Jun 22, 2017, 17:40:19 »
What OD on these?  Metalgear shows a rotor with 78mm dia 5 bolt pattern with 296mm rotors.  You might be able to make those work, if you can figure out what bike they're off of.  There might be something else for a different dim.

http://www.metalgear.com.au/mgear-brake-disc-front-p-6786.html
that's the same rotor on my cx, and I'm pretty sure all the comstar wheels. Which is 296mm. GSXR 6-1K is 310mm and the Busa <07 is 320mm. I'm not sure what gsxr front end he is using. But at minimum, if it is radial mount calipers they accept 310 or 320(with 5mm caliper spacers) rotors
1974 Honda CB360
1979 Honda CX500
2005 Harley Davidson Sportster 883

Offline rs_ss350

  • Posts: 88
Re: Comstars + gsx-r front end
« Reply #47 on: Jun 22, 2017, 22:22:32 »
These are the rotors I'm trying to use.  https://www.ebay.com/itm/162371524479 looks like the OD IS 300... assuming that's not gonna work?  I'll probably then have to use the gsxr set I have.

These are the forks https://www.ebay.com/itm/172568993897
« Last Edit: Jun 22, 2017, 22:27:44 by rs_ss350 »
1979 CB750K - 10th Anniversary Limited Edition
1982 CB750K - Cafe/brat project under construction
1977 CB750K - another project!

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Offline irk miller

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Re: Comstars + gsx-r front end
« Reply #48 on: Jun 22, 2017, 22:29:39 »
Those rotors are 300mm.  I usually try to match rotors to the front end, unless the bolt pattern is a match, then I focus on OD.  You're going to need to figure out a way to run your calipers with 300mm rotors instead of 320mm to run that setup.  The GSXR is 6 bolt.  You're going to have to draw up the pattern to see how the holes line up.  It's usually pretty messy.

Offline rs_ss350

  • Posts: 88
Re: Comstars + gsx-r front end
« Reply #49 on: Jun 22, 2017, 22:36:02 »
Hmm, something is off on the gsxr rotors I bought then... these have 5 holes... https://www.ebay.com/itm?itemId=322469292439
1979 CB750K - 10th Anniversary Limited Edition
1982 CB750K - Cafe/brat project under construction
1977 CB750K - another project!

Member of Moto Guild SF