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Author Topic: 6" to 8" rotor  (Read 2565 times)

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Offline Slowy

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6" to 8" rotor
« on: January 12, 2009, 06:45:51 PM »
my bike came with 6" Hayes stroker Ryde's.
i jacked up my front brake at santos and as an anniversary, i got a replacement front brake in an 8" rotor.
i didn't order the caliper spacer at the same time though...DOH!
looked on pricepoint and found the adapter for 16.99 + shipping
called AJ's last week, talked to a guy, told him my situation and asked about the adapter/spacer. he said he could order it if i called before monday.
forgot to call before monday
called today and the guy said that an 8" rotor wont work with a quick release skewer and its a strict policy (or something like that) not to put 8" rotors on bikes with quick releases.
he then said that it wouldnt work because the spacer/adapter is meant for bikes with thru axle's and due to the discs being about 1/2 inch different in location (side to side), that if i got the adapter, it wouldn't work.

my caliper that came with my 8" rotor is on my bike now and working 100%
the spacers/adapters i've seen on pricepoint, don't look they they have any bend to them to relocate the caliper that 1/2 variance

what do you guys think?  the spacer is only $20.00
Joe


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Offline slowfatguy

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Re: 6" to 8" rotor
« Reply #1 on: January 12, 2009, 06:48:21 PM »
I've never done it, but I see lots of guys running 180 rotors and quick release front hubs. ???
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Offline Triple T

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Re: 6" to 8" rotor
« Reply #2 on: January 12, 2009, 06:59:59 PM »
I didn't know it was an issue.  I have a 180 front rotor and QR.
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Offline Slowy

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Re: 6" to 8" rotor
« Reply #3 on: January 12, 2009, 07:03:13 PM »
i just googled "203mm rotor" and found this posted in a discussion, this is kind of what the guy at AJ's said


203mm front disc

Postby Heflinkw on Thu Aug 24, 2006 12:53 pm
If I understand Zed-xtra correctly, he is using a 203 mm front rotor as well. I would advise against both the 185 and 203 mm configurations in front unless you have a through axle on your front fork. Large rotors can generate forces that QRs are not designed to handle, and the force at the dropouts is generally in a direction that would eject the wheel from the dropouts. I am sticking with 160mm in front and 203 in the rear.


Joe


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Offline Slowy

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Re: 6" to 8" rotor
« Reply #4 on: January 12, 2009, 07:03:59 PM »
I've never done it, but I see lots of guys running 180 rotors and quick release front hubs. ???
I didn't know it was an issue.  I have a 180 front rotor and QR.

the 8" is a 203mm though
Joe


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Offline DeV

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Re: 6" to 8" rotor
« Reply #5 on: January 12, 2009, 07:09:30 PM »
i just ordered an Avid bb7 with a 203mm rotor for my front end.. and i have a QR.. my stock brake is a 6 inch rotor.. i didnt know it was a bad idea to use it.. now ill have to get a different adapter so that i can run the bb7 with the smaller rotor... awesome.

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Offline Slowy

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Re: 6" to 8" rotor
« Reply #6 on: January 12, 2009, 07:48:24 PM »
^ i hear running an 8" in the rear is no biggie though, so if you have the 8" and it turns out that putting an 8" rotor on a 6" fork application, just put the 8" in the back. that's what i'll do
Joe


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Offline tangodown

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Re: 6" to 8" rotor
« Reply #7 on: January 12, 2009, 08:27:49 PM »
Go look at bikes in your LBS.  Many come with 203mm rotors and QR hubs.  I have two buddys with Specialized Enduros with the Marz forks, QR and 203mm rotors.  I myself just switched to 203 in front from a 160.  Im sure if you have a modern fork it should take the added torque from the larger rotor.  Now you have me looking for more info...........
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Offline eclark

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Re: 6" to 8" rotor
« Reply #8 on: January 12, 2009, 08:35:41 PM »
I ride a standard QR front with 203, never had an issue.  And it seems like a waste to put 8 on back and 6 on front when your front does most of the braking.

Offline Slowy

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Re: 6" to 8" rotor
« Reply #9 on: January 12, 2009, 08:53:35 PM »
^ thats what i was thinking. but if i already have the rotor, i'm gonna put it somewhere dernit!
Joe


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Offline Triple T

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Re: 6" to 8" rotor
« Reply #10 on: January 12, 2009, 09:09:51 PM »
Sell it to help defray the cost of your head gasket and rebuild
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Offline Slowy

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Re: 6" to 8" rotor
« Reply #11 on: January 12, 2009, 09:21:48 PM »
sell a 8" rotor by itself, lol
i MAY be able to get $10 for it, hahaha
Joe


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Offline Triple T

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Re: 6" to 8" rotor
« Reply #12 on: January 12, 2009, 09:25:08 PM »
Any little bit helps
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Offline catman

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Re: 6" to 8" rotor
« Reply #13 on: January 12, 2009, 09:33:04 PM »
I've got two bikes hanging in the garage right now that have 8 inch rotors up front. Both have 20mm hubs but not sure about that being totally necessary. I also want to check into this further. Good topic, thanks for bringing it up.

Btw, you would think that the fork would have a warning label on it about this.
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Offline Slowy

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Re: 6" to 8" rotor
« Reply #14 on: January 12, 2009, 09:35:21 PM »
or at least the website selling the adapter would have a little blurb about it in the description
Joe


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