Anyone know anything about disc brakes?

Around town I can't imagine it being an issue - I have 'unknown' sized rotors on the Inbred and stop super fast.

I'm more concerned with long mountain descents. I'm not the kind of chump that drags my brakes but I am the kind of idiot that will see how fast he can get going before the next corner.. so is heat dissipation an issue or is that just paranoia from most peeps?

That's a good point - going from rim braking all my life to discs I'll probably let loose the tyres way before I need to worry about the discs :S

I've yet to test the photo bike on a mountain descent (or even a decent London decent for that matter) yet. So don't listen to me.

so is heat dissipation an issue or is that just paranoia from most peeps?

It is an issue.

But just size up and go full heat-sink crazy when you go to the alps. No need for it bimbling around the UK, unless tandemz.

But if the fork is post mount I'd chuck an adapter on it anyway, if it meant I wasn't adjusting the bolts in the fork itself each time I fetteld with the brake.

Did someone say something?

You mean as a way of protecting the fork from repeated screwing in/out of disc mount?

I'd chuck an adapter on it anyway, if it meant I wasn't adjusting the bolts in the fork itself each time I fettled with the brake.

Do people damage the threads that often? Surely they have these for hands.

Yes.

^ I don't know, but a) fork is crabon, not like an alu frame or magnezium lower, and b) risk reduction at pretty much zero cost is a good thing.

Surely they have these for hands.

Actually, having seen how many threads there have been on Singletrack, asking about fitting a helicoil to their brake mount...

Everyone fucks things up from time to time (except Tester, probably) - it's then a crap shoot on the thing you fuck up. Get lucky and it's rounding off a bolt. Unlucky and you've ruined a £200 postmount fork.

From a consumer's perspective flatmount and IS are both better standards.

How does flat mount remove the risk of fucking up the fork? Aren't you still just bolting a caliper to a fork?

Everyone fucks things up from time to time

After accusing other people of being hamfisted, I'll no doubt mangle the next component I attempt to install :-/

@hippy I was worried about the rotor size too, and talked to other club riders that use discs and compete in really hard climbs/descents like the Angliru in Asturias, all of them use 140mm rotors, but weight 1/3 less than me (85kg), and only one is thinking about getting 160 in the front.
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You can see Chechu Rubiera descending with discs vs rims here
https://www.youtube.com/watch?v=9qqiohJGM98

Since my Kinesis 4S can't handle a 160mm rear rotor (because they have retarded designers or bad welding batches), I looked at the Shimano Freeza rotors but my wheels got 6 bolts mount instead of centerlock... So after searching alternatives I've bought a pair of 140&160 Reverse Aircon:

As I understand it the flat mount fork has no threads - the bolts are fed through from the front and screw in to threads on a mounting plate, on which the caliper is then bolted.

Or maybe not, I dunno, at least it looks like the caliper is bolted to something rather than directly to the fork.

It's a bit of a mess but then it's better than PM in the context of the not fucking up your fork discussion.

Flat mount in the rear is just holes to pass the screws through

But the flat mount in the fork has threads! Haven't seen any fork without them

Still threads.

Ya so like post mount + adapter - so at least the screws you dick around with aren't the ones going in to your fork.

Or maybe not, I dunno, at least it looks like the caliper is bolted to something rather than directly to the fork.

A pic of the rear flat mount

And that's a 140 rotor? You will not be fitting a 160! Jeeze.

No, that was a pic with the 160mm rotor that I sent to Kinesis asking for WTF they where thinking while advertising the frame as "160 compatible" and including a 160mm rear adapter in the box. They sent me a free TRP 140 rotor and adapter, but no clarification about what went wrong (design or welding). The new 140 rotor gets enough clearance.

They sent me a free TRP 140 rotor and adapter, but no clarification about what went wrong (design or welding). The new 140 rotor gets enough clearance.

Tried another hub? Could be your hub having the rotor further towards the NDS than the hubs they tested / designed with.

I lightly abraded and then cleaned my disc yesterday. I also filed the pads back again. The rotor looks straight and the pads look parallel and centred to the rotor. My front brake still squeals badly. Why?

Yep, with some Giant wheels from my girl's Avail and unbranded rotors, but @TurtleRecall was the first to notice the problem in his own Kinesis with DT swiss r24db and shimano rotors after finding some heavy rubbing in the inside of the chainstay. So 3 wheelsets and rotors combinations. I tend to think that its a bad production batch... but still no official response.

Bummer. 160mm rotor rear might be overkill for most though. It's what I have on my monster trail bike with Hope Tech X2s.