Rotor Size?

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Mar 3, 2004 | 08:09 PM

Fuzzylogic

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From: Lexington KY

Car Info: 04 Rally Blue Wrx STi

Rotor Size?

What is the largest size rotor that will fit a 17x7.5 wheel, while still using the stock calipers?

Mar 7, 2004 | 05:40 PM

Fuzzylogic

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Car Info: 04 Rally Blue Wrx STi

473 people don't know the answer? Harder question than I thought.

Mar 7, 2004 | 06:23 PM

rustokman

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From: Encinitas CA

Car Info: Black 03 WRX

It depends on the inside diameter of your rim. There are some 17 inchers that will fit the big brake kits and some that won't. Ask the manufacturers about that one.

Mar 7, 2004 | 06:37 PM

Kevin M

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From: Reno, NV

Car Info: 1993/2000/2001 GF4 mostly red

Re: Rotor Size?

Quote:

Originally posted by Fuzzylogic
What is the largest size rotor that will fit a 17x7.5 wheel, while still using the stock calipers?

I depends on a lot of other factors, primarily which aftermarket calipers will fit under your wheels. STi Brembos and Stoptechs have large rotors but don't fit under all wheels (particularly the Brembos). If you tell us which wheels you have and how much you have to spend on brakes we'll find your largest rotors.

Mar 7, 2004 | 06:56 PM

Fuzzylogic

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Car Info: 04 Rally Blue Wrx STi

Sorry for being vague on the info I was looking for. I was interested in using stock calipers with larger after-market rotors.

Mar 7, 2004 | 07:03 PM

Kevin M

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You can't do that without modified caliper brackets. Have you already found some (which should specifiy what size rotor to use) or do you plan to make your own brackets?

Mar 7, 2004 | 07:09 PM

Fuzzylogic

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Car Info: 04 Rally Blue Wrx STi

If the caliper bracket is the limit to the rotor size a stock caliper can use I will see what info I can find concerning them.

Mar 10, 2004 | 06:25 PM

Kobayashi

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Quote:

Originally posted by Fuzzylogic
If the caliper bracket is the limit to the rotor size a stock caliper can use I will see what info I can find concerning them.

In general, unless part of a well-designed front and rear set, rotor only upgrades are a bad idea for a couple of reasons:

1. Moving the caliper out significantly increases brake torque per fluid input which can limit your modulation range and potentially radically upset the front to rear bias with poor results. If you do do a rotor upgrade, some changes to keep the rears up with the fronts is going to a requirement just to maintain stock performance. You have more chance of decreasing performance than increasing it unless a lot of work has gone into the design.

2. Increasing the diameter of a rotor without increasing its thickness leads to a rotor with poor structural integrity. Definitely wont work under track conditions. And if youre not gonna track it, you dont really need a bigger rotor.

k.