I was looking into buying a micrometer to measure the thickness of my rotors, but only found micrometers that goes up to 1 inch. Problem is, the rotors are slightly thicker than 1 inch, so I need a micrometer that can go slightly higher. Anyone was successful in finding a suitable micrometer for this job?

 

Why not use something like this... It may not be quite as accurate as a micrometer, but it should get you close enough for a caliper measurement.


... and they're pretty cheap ($40).

 

If you're going to use calipers as pictured above you'll need to pick up a set of caliper accessories/tools to allow measurement of calipers. The attachments allow you to "reach around" the lip of the caliper to measure the center thickness. You can pick up the attachment/accessories from www.mcmaster.com

 

Cool, thanks for the information. My problem with using a caliper is, like you said, reaching around the lip, so if I can get an accessory to get around that, then that would solve my problem. I'll check out the McMaster.com site.

 

Zero the tool with two dimes in between, then put a dime on each side of the caliper and measure. Simple fix - still reasonably accurate.

 

Clever Slider!

 

Indeed, and only costs 20 cents :-) (+ the caliper, which I already have)

 

I bought this one at an auto parts store. It's specifically for measuring brake rotors so it is offset to fit over the lip. It costs about 30 bucks.

http://www.greatnecksaw.com/product_info.php?cPath=257_355_359&products_id=915 43&osCsid=6cdc3373e0ecce994cc9f0135d74db11

 

1) FYI - Chickenpluckers link didn't work
2) Search for a 1-2" micrometer. They come in all sizes and some have attachments (insead of the dimes) or even ball attachments for a few dollars.
3) Harbor freight has some, so you could bring the part in an see if it works
4) I have seen some old school micrometers on ebay cheap. Everyone wants digital these days.
5) I don't know that I would go with calipers, evertime you take a reading you get a different result.

J

 

It must have been damaged when GT3 Chuck edited it. Anyway, follow link click on:

OEM Auto Specialty>>Brakes>>Disc Brakes>>OEM Micrometer for Disc Brake Rotor


I tried putting the link in as text but everytime I previewed it turned back into a link...

 

A little off topic but what is the max wear the rotor can go to?

 

For a 996 non GT3

Wear limit
Front 26mm
Rear 22mm

Replace when they're worn to these limits. Can be machined also to:

Front 26.6 mm
Rear 22.6mm