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Replacing rotors 6" to 8", possible?

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Replacing rotors 6" to 8", possible?

Old 09-13-05, 02:53 AM
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blue_neon
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Got a friend who has a bike with 6" disk brakes and want's to change the rotor to 8". Is it possible to change the rotor while keeping the rest of the brake intact? Or does he need to get a whole new disk brake set for a bigger rotor? I'm assuming he needs to get a new 8" brake set but I dont own any disk brake bikes at the moment so i wouldn't have a clue!

Thanks for help.
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Old 09-13-05, 03:49 AM
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Originally Posted by blue_neon
Got a friend who has a bike with 6" disk brakes and want's to change the rotor to 8". Is it possible to change the rotor while keeping the rest of the brake intact? Or does he need to get a whole new disk brake set for a bigger rotor? I'm assuming he needs to get a new 8" brake set but I dont own any disk brake bikes at the moment so i wouldn't have a clue!

Thanks for help.
I think all he needs is an adapter, and then he's golden.
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Old 09-13-05, 07:23 AM
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Normally all that is needed is the 8 inch disk and the adapter. Everything else will work fine. You may have to get some shims to align the caliper to the rotor since the adapter may not position the caliper perfectly and the adjustment range may need help. It really isn't a big deal, takes maybe 15-20 minutes to do the swap.
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Old 09-13-05, 07:40 AM
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Originally Posted by motomickey
Normally all that is needed is the 8 inch disk and the adapter. Everything else will work fine. You may have to get some shims to align the caliper to the rotor since the adapter may not position the caliper perfectly and the adjustment range may need help. It really isn't a big deal, takes maybe 15-20 minutes to do the swap.
Shims? What? When you remove and reinstall a caliper, of course you are going to have to realign it to the disk however, I fail to see a need for shims if you know what you are doing and its a non-Shimano brake. For Hayes and Avid you just need a 8" mounting bracket and an 8" rotor. All their calipers up to a 10" rotor are the same.
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Old 09-13-05, 07:58 AM
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Can anybody find a link for these adapters? Preferably for Avids?
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Old 09-13-05, 08:03 AM
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http://pricepoint.com/detail/12752-1...ke-Adapter.htm
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Old 09-13-05, 08:04 AM
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http://www.discbrakeadapters.com/
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Old 09-13-05, 06:06 PM
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Originally Posted by Drunken Chicken
I think all he needs is an adapter, and then he's golden.
A word of warning though. His fork may not be capable of handling the increased forces of the 8" rotor.
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Old 09-13-05, 07:11 PM
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Originally Posted by willtsmith_nwi
A word of warning though. His fork may not be capable of handling the increased forces of the 8" rotor.
Ditto, also the frame may not be designed for an 8" rotor either.
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Old 09-13-05, 08:02 PM
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Thanks for replies. His fork is a Suntour Magnesium to my knowledge, would this be 8" compatible?
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Old 09-13-05, 08:12 PM
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Sweet mother of God, no. Unless its some Suntour I have never seen before, no no no no no.
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Old 09-13-05, 09:12 PM
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how about a dj3?
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Old 09-13-05, 09:29 PM
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Originally Posted by TroyLeeRacer199
how about a dj3?
If it's the 20mm version it should be ok, if the QR version, then no.
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Old 09-14-05, 12:10 AM
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Originally Posted by blue_neon
Thanks for replies. His fork is a Suntour Magnesium to my knowledge, would this be 8" compatible?
Gotta back seely on this one.
No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! No! A thousand more times NO!
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Old 09-14-05, 12:16 AM
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I think we get the point Raiyn...
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Old 09-14-05, 12:18 AM
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Originally Posted by sS-bEn
I think we get the point Raiyn...
Really? That's good, because I was trying to show a bit of restraint.
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Old 09-14-05, 12:33 AM
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Raiyn - you posted 'No' 326 times, and 'NO' 1 time. You show no signs of restraint .

I have another fork for the '6" to 8" changeover'... Marzocchi MZ-3? Possible?

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Old 09-14-05, 12:37 AM
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Originally Posted by blue_neon
Raiyn - you posted 'No' 326 times, and 'NO' 1 time. You show no signs of restraint .

I have another fork for the '6" to 8" changeover'... Marzocchi MZ-3? Possible?


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Old 09-14-05, 12:41 AM
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Originally Posted by blue_neon
Raiyn - you posted 'No' 326 times, and 'NO' 1 time. You show no signs of restraint .
I was planning on doing an entire page of them but held back. I kept them all at normal text size to boot
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Old 09-14-05, 01:04 AM
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Originally Posted by KonaRider24
Nein.
Habe Zustimmung, dunke für Ihre Hilfe, ich nie gewusst, dass Sie Deutsch sprechen könnten?

Last edited by blue_neon; 09-14-05 at 01:29 AM.
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Old 09-14-05, 01:35 AM
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Cool, well it looks like some of the 'cheaper' forks arn't compatable.
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Old 09-14-05, 01:45 AM
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Let me guess: RST Gila - NO NO NO?
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Old 09-14-05, 02:14 AM
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Originally Posted by Drunken Chicken
Let me guess: RST Gila - NO NO NO?
I'd say so.
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Old 09-14-05, 03:28 AM
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Originally Posted by sS-bEn
I'd say so.
Damn! How come? Is it that the fork will have play in it? Will it snap? 'Cause I already have a front Juicy 5 with 8" rotors.
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Old 09-14-05, 03:49 AM
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Originally Posted by Drunken Chicken
Damn! How come? Is it that the fork will have play in it? Will it snap? 'Cause I already have a front Juicy 5 with 8" rotors.
Yes you will crash and burn, crash and burn good .
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