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Old 05-16-09, 03:27 PM   #1
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140mm rear disc, am I the only one?

So I just set up my hardtail with 160/140 front/rear BB7 brakes, and after one ride I am very happy. After a short break-in the 140mm rear seemed great even with a real grippy 2.1" tire. Is anyone else running 140 rotors with mountain calipers?


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Old 05-16-09, 03:50 PM   #2
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I would never admit to it if I was...I'd never live that one down.
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Old 05-16-09, 03:56 PM   #3
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Well before i was using 203/160 front/rear with an '01 SID fork. That was a little too flexy for 203...
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Old 05-16-09, 03:57 PM   #4
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So you're saying now you have plenty of braking power...but not so much as to flex the dickens outta the SID?

I've been told that some 140mm rear rotors are much, much quieter than some 160mm rear rotors...on some frames, and if you don't live in an area with a ton of DH where you'll make it glow...you may as well go with the smaller ones.

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Old 05-16-09, 05:47 PM   #5
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I have more braking power than grip in the rear it seems. The 160's weren't to noisy before except for the occasional squeal when muddy. I'll have to go for a nice muddy ride with the 140 to test that out.

With a 203mm rotor that SID would flex so much that the brakes would rub while cornering on pavement. That was quite the overkill.
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Old 05-16-09, 05:51 PM   #6
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im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
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Old 05-16-09, 05:52 PM   #7
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Quote:
Originally Posted by ponchotempest View Post
So I just set up my hardtail with 160/140 front/rear BB7 brakes, and after one ride I am very happy. After a short break-in the 140mm rear seemed great even with a real grippy 2.1" tire. Is anyone else running 140 rotors with mountain calipers?
I use 140mm calipers, but on a smaller wheel - not on a 26" wheel.

Just curious as to why you opted for a 140 at the rear instead of the usual 160. Did you do it so that it would minimize rear wheel lock? If you're planning to run "skinnier" tires than the 2.1 on the rear, this makes even more sense.

A smaller rotor would theoretically be more likely to overheat during prolonged braking, but if you hardly do that in your style of riding, then a 140 would probably hold-up as well as a 160 rotor...

Out of intererst, is your 140 an original Avid rotor? I'm interested in the rotor shape... any pics?


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Old 05-16-09, 06:34 PM   #8
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It still locks up pretty easy with the 140, but obviously not quite as easy as 160. I'm not really worried about overheating anything on this bike, it only weighs about 25 lbs or so.

Its an Avid Roundagon rotor, but i'm not sure if they sell the 140mm rotor with a mountain caliper as a package. I could be mistaken, though.
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Old 05-16-09, 06:35 PM   #9
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Originally Posted by Lebowski View Post
im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
Naw, it's bigger than my 32t 1st gear
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Old 05-16-09, 06:38 PM   #10
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im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
Invest in a 0mm dork disc.
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Old 05-16-09, 07:02 PM   #11
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Old 05-16-09, 07:05 PM   #12
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^^^^
We really need to stage an intervention.
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Old 05-16-09, 07:08 PM   #13
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I had my own reasons.
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Old 05-16-09, 07:12 PM   #14
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thats 140 rear?

Heres mine before with the big brakes:
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Old 05-16-09, 08:16 PM   #15
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I had my own reasons.
It just seems like you came 180 compared with 6 months ago

But I really do like your bike. Whatever works, right?
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Old 05-16-09, 08:44 PM   #16
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Quote:
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that SID would flex so much that the brakes would rub
Your SID was flexy? Unbelievable.
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Old 05-16-09, 08:46 PM   #17
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Ed-

I know you're a big fellah, but.............there's something wrong with your seatpost..........it's bent.
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Old 05-16-09, 09:43 PM   #18
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you need some more cable ties on that top tube
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Old 05-16-09, 09:51 PM   #19
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Your SID was flexy? Unbelievable.
In general, quick-release forks with 10mm drop-outs should be fitted with 185mm rotors as max. Larger 203mm rotors are better suited for forks with 20mm thru-axles.
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Old 05-16-09, 09:54 PM   #20
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Sids have never been known to be flexy.
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Old 05-16-09, 10:37 PM   #21
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i have one question. How is the pad placement on the disk, are they fully contacting the disk or partially?
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Old 05-17-09, 03:38 AM   #22
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A friend with an 08 Epic, "Dealer Edition" in red. has a 140 rear. It's got all the stopping power a rear brake needs in this area.
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Old 05-17-09, 06:34 AM   #23
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+1

Oh my crap...I woke up...and my sig... BWAHAHAHAHA!

That's classic!

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you need some more cable ties on that top tube
Yah...it's a bit of overkill.

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Old 05-17-09, 07:40 AM   #24
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I ran a 140 (XTR centerlock) on the rear of my old Litespeed - rear disk conversion - it was the only disk that would fit my frame. Ran it for a year with no issues.
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Old 05-17-09, 02:58 PM   #25
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i have one question. How is the pad placement on the disk, are they fully contacting the disk or partially?
They contact the disc properly as long as you have the correct adapter.
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