"Stopping power" and "weaker calipers" - this factors are more important,
I am trying to find any subjective or objective reviews about this factors
"Stopping power" - this is my main concern, I'd like to know how longer will be stopping distance
and how significantly more input required to perform the same maneuvers as with 160 rotors
my guess it is less significant difference on hydro, and more significant on mechanical (spyre)
"Weaker calipers" - this is first time I am hearing about it.
first gen road caliper BR-R785 was copy of mtb calipers BR-M785,
is someone made a comparison of BR-R785 vs new flat mount calipers + 160 adaptor?
I think 140/140 on a bike is absolutely fine for a low weight drivers (~under 80kg) no matter where is the bike mostly used.
To be on the safe side it's better to use the metallic pads that won't fade, but they might squeal like a mother f*cker.
uraz wrote:Road calipers are much weaker than those from mtb. 140 mm in front is acceptable only at low speeds (ex. CX course) due to lack of stopping power and heat management.
I'd also add a time trial or tri bike to that list. Definitely 160mm front for road bike.
1. Brake pads in shimano flatmount calipers are much smaller ~20% (calculated measuring next photo)
this explains all the difference in power
[08.11.2017 update: conclusion is wrong, link to youngs_modulus post with more info]
2. It is possible to use 140mm front rotor with powerfull Shimano MTB calipers using this flat to post mount adaptor:
SM-MA-F140P/D (weight 25g @ bike24)
two piston BR-RS785, BR-R785, BR-M785, BR-M9000 will give 20% extra power
four piston BR-M8020 will give 40% extra power (and cooking abilities on 140mm rotor)
3. There are some 140mm postmount forks, but they are hard find
4. Mechanical disc TRP Spyre Flat Mount version performs the same as Post Mount version according to review link
(uses Shimano M525 MTB brake pads, should be weaker vs road hydro calipers, but not that big difference as BR-R785)
5. TRP Hylex RS FLAT MOUNT road hydraulics caliper uses Shimano M525 MTB brake pads
there is a good chance that it is compatible with shimano hydro STI (and gives 20% extra braking surface)
(previous model non-RS TRP Hylex was compatible with Shimano STI)
Only reason I see, why road brakes are so pathetic is that some guys (and girls) don't want or can't handle brakes that are able to throw them out of a bike. Also very strong brakes could be problematic in rain.
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