Someone has 240 front vented rotors, Brembo/ATE, that they say is for ATE calipers. I have Girling calipers, why should the caliper matter, shouldn't these fit either? Thanks.
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'86 244 160k, 88 245 185k, 90 245 153k, 90 745 waiting for me to fix

Bonzo,

The ATE's are two mm thicker than the Girling.

ATE 24mm
Girling 22mm

Same diameter, 263 mm.

Hope this helps,

RonJ

Brembo rotors have their p/n stamped on the outer edge of the rotor:
For 240 fronts, it's VO905 -- this is what I use, and I have Girling calipers.
And, BTW, for 240 rears, it's VO906 -- I use these with my ATE rear calipers.
So if you have Girlings in front (99.9999% of us do), as long as your rotor says VO906, it's correct!

I would have thought that there's no difference in rotors between ATE and Girling front calipers. But maybe there is a difference anyway (based on the next paragraph). I don't know why, but I could speculate, e.g., different dimensions of the mounts, and therefore the rotor is more outboard or inboard? I don't know why.

But get this! Looking at my copy of the Volvo Quick Reference Parts Catalog (a publication by Volvo for their dealerships' Parts Counter guys) dated April 1990, on page 91 it shows this:
For 240 Front Rotors, 1975-on, there are two different ventilated rotor part numbers for Girling calipers and for ATE calipers (along with a third rotor, a solid one for Girling).
Girling front caliper, ventilated rotor: 270739-6
ATE front caliper, ventilated rotor: 270738-8

So if there is no difference, why are there two different ventilated rotors, one for each different caliper? I don't know -- I'm only reporting what the Volvo parts catalog shows!

Thanks. I played it safe and just ordered a pair of Brembo's from FCPGroton. After the post,the seller emailed me back saying also that there was a difference. Maybe in the thickness? I would think that they would be the same. I was trying to save a few bucks, I found a pair on ebay, here's the place:
http://cgi.ebay.com/ebaymotors/VOLVO-242-244-245-262-264-FRONT-ROTORS-BREMBO-ATE-NEW_W0QQcmdZViewItemQQcategoryZ6763QQitemZ230109378008QQrdZ1QQsspagenameZWDVW
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'86 244 160k, 88 245 185k, 90 245 153k, 90 745 waiting for me to fix

re: "...I would think that they would be the same...."

Yes, I would have the thought the same as you if it weren't for being able to look it up in the parts book that my local Volvo parts mgr passed on to be when he received a later issue (he's my neighbor -- so I he does me favors like that).

This is on ebay, apparently they only fit ATE calipers(front!), which I've never had on any of my (8? I lost track) 240's, starting with 1979. Maybe these were only used '75-'78 or somewhere in there.

http://cgi.ebay.com/ebaymotors/VOLVO-242-244-245-262-264-FRONT-ROTORS-BREMBO-ATE-NEW_W0QQcmdZViewItemQQcategoryZ6763QQitemZ230109378008QQrdZ1QQsspagenameZWDVW
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'86 244 160k, 88 245 185k, 90 245 153k, 90 745 waiting for me to fix

Caliper doesn't matter.