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disc brakes: 180 front, 140 rear?

Old 06-23-16, 08:52 PM
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batpot
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disc brakes: 180 front, 140 rear?

I rarely see any configs where the front is more than 1 size bigger than the rear (e.g. 180/160, or 160/140), and just as - if not more common - they're the same (e.g. 160/160). Why not go 180 front and 140 rear? This config came to me for 2 reasons: 1. Want more stopping power from mechanical disc road brakes 2. Currently have 160/160, and noticed quite a bit of dings/scratches on the rear drop out, right around where the rotor comes closest to it. a 140 disc would have a good bit more clearance. (I can't believe it'd been able to torque over that far, but the scratches didn't make themselves.)
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Old 06-23-16, 09:32 PM
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I would definitely check to see if your frame can accommodate a rear rotor smaller than 160. Mine is 160 and post-mount, and won't fit anything smaller. I am running 180 in the front (stock was 160) and immediately noticed better braking balance.
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Old 06-24-16, 11:03 AM
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+1 check that the mounting brackets/hardware can put the caliper in a position to accommodate the rotors you want, if that's ok, then more (braking) power to you!
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Old 06-24-16, 12:06 PM
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Originally Posted by RubeRad
+1 check that the mounting brackets/hardware can put the caliper in a position to accommodate the rotors you want, if that's ok, then more (braking) power to you!
You really mean 'less braking power to you', actually...
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Old 06-25-16, 10:55 PM
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Originally Posted by DrIsotope
I would definitely check to see if your frame can accommodate a rear rotor smaller than 160. Mine is 160 and post-mount, and won't fit anything smaller. I am running 180 in the front (stock was 160) and immediately noticed better braking balance.
interesting...wouldn't have thought I couldn't size down. Will keep that in mind.
appreciate the feedback on sizing up, also; sounds like a good plan.
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Old 06-27-16, 10:04 AM
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My Soma Saga's fork can't take a 180mm disc. It doesn't really matter, when I'm heating up my brakes it's from dragging them. If I have to drag a brake, I drag the rear brake, much safer if I have to turn (esp when it's wet or icy). If you look at some downhiller's bikes, the rear disc is bigger than the front because they almost never use the front brake.

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Old 06-29-16, 10:02 AM
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On a related subject, I have 160 mm front/140 mm rear, and the rear brakes seem to give me more stopping power than the front. Does this sound right? I've never ridden another bike with disc brakes and have nothing to compare it to.
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Old 06-29-16, 10:46 AM
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does not sound right to me. Front brakes generally provide more stopping power because of weight distribution especially as you are thrown forward while stopping, and a larger rotor should make that difference even bigger
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Old 06-29-16, 10:53 AM
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Originally Posted by RubeRad
does not sound right to me. Front brakes generally provide more stopping power because of weight distribution especially as you are thrown forward while stopping, and a larger rotor should make that difference even bigger
Sort of.

Fronts do more of the work because of weight transfer and a larger rotor will accommodate that better.

That's why virtually all cars have larger front brakes...
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Old 06-29-16, 10:58 AM
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Not that we are talking about the same kind of bikes... the Surly Pugsley comes with 180/160 stock.
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