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forum
disc frames
<p>hello people,</p>
<p> I'm in the process of building my own carbon road disc bike. When buying the frame, is it best to buy a frame with flat mount for the disc brake which I will buy hydraulic, should I buy the 140mm disc or 160mm disc, and is centerlock the best?</p>
<p>thanks,</p>
<p>David</p>
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
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13 comments
6 bolt doesn't take ages to change. It takes 5 minutes & is a job that rarely needs doing.
Reckon I could do centre lock in about one minute, agree its rare, but I did lose traction once and slide the wheel under a railing, leaving a nicely bent rotor.
140 rotors are fine for a road bike. Hydraulic is vastly superior to cable. I've not noticed any performance difference between center lock & 6 bolt. In an ideal world you'd have flat mount & thru axle but personally I think thru axle is important.
What frame have you got?
performance difference comes when changing a rotor. 6 bolt take ages to change.
I’m another with 140mm rotors front and back. Mine differ on my two bikes;
1. Ashima 6 bolt rotors with Shimano BR-RS785 di2 hydraulic shifters and associated post mount calipers. Uberbike race matrix pads. Work a treat.
2. Shimano Freeza Dura Ace centrelock rotors with Dura Ace 9170 di2 hydraulic shifters and flat mount Dura Ace calipers. Still on original Shimano pads (as Uberbike have not produced a compatible pad yet).
Braking wise I can’t feel any difference, both absolutely spot on. Aesthetically the Dura Ace flat mount and Freeza rotors, coupled with the Dura Ace shifters win hands down.
My winter bike still has SRAM 160mm rotors with cable operated BB5 brakes, which work ok when set up properly, but only ‘ok’ when compared to the other bikes which are in a different league all together.
PP
It seems the bike industry is settling for flat mounts on road bikes and post mounts on MTB. Both work superbly. Flat mount does have the aesthetic edge on a road bike though.
thanks, this is very helpful.
Flat mount hydraulics are the best. I have 140 on my road bike and 160 on my winter bike (I'm 66kg - prefer the larger rotors for the winter bike gives more control in the rain).
Centrelock is much nicer than 6 bolt! Easier to mount and more robust.
thanks. I think I will go with hydraulics on a flat mount road disc frame with 140mm disc's and get the semi-metallic pads.
Just as good?! Mate, you will be amazed! I definitely was and I run very good rim brakes on my winter bike (Ultegras with swisstop green pads) and discs are still way more powerful. I'm running the default Shimano pads but will switch to semi-metallic eventually.
so, hydraulic brakes are just as good as mechanical and what type of pads do you recommend?
Agree, 140 mm are more than adequate. I've just built a Strael with Ultegra hydraulics and 140 mm discs and it's absolutely more than capable of stopping me as fast as I want. I'd definitelt go flat mount as well, if only to future proof your bike. No real difference between 6 bolt and centrelock. My wheels are centrelock but used with with 6 bolt discs and an adaptor. Two ways of achieving exactly the same ends.
I have 140mm discs on my Trek and they seem more that adequate when riding around the South Downs. I’m 90kg and riding down wet mud covered 15% gradients has never caused me any problems with the smaller size discs.