Bought new brakes (TRP DH-R EVO) to replace the stock Shimano on Rail 9.7 with 203 ice tech rotors/finned pads. Braking power alright, but roasting the rotor a bit almost anytime above 20mph (a lot). TRP thicker 2.3 rotors so shouldn’t heat up and warp and rub as much, but considering 220 or 223mm rotors front and rear. Anybody know if at least a 220 rotor fits the rear. Local Trek store mechanic said it should but I think Trek website says 203 max out back. I am +200lb rider who likes to ride fast and hit the steeps, so need something a little more than Shimano 203.
Biggest rear rotor for Rail?
- Thread starter jgusta
- Start date
I’m a 165lb rider on a Rail9.7. I’ve ordered the mt7’s (front/rear and 220mm rotors). I sometimes pack up to 50lbs of tools/materials (trail building at high elevation) and experience brake fad on long decents or heavy braking. I currently have the Shimano w/203 ice rotors f/r.
Now I’ve read that a lighter rider may not want the 220mm rotor because there may not be enough heat for efficient braking. And does the 4-pad/2-pad system make a difference? Does the thicker Magura rotor(220) dissipate heat too efficiently?
It seems like I have two riding styles for one bike.
Now I’ve read that a lighter rider may not want the 220mm rotor because there may not be enough heat for efficient braking. And does the 4-pad/2-pad system make a difference? Does the thicker Magura rotor(220) dissipate heat too efficiently?
It seems like I have two riding styles for one bike.
I use Uberbike E-Matrix or Race-Matrix pads
Thanks. did not know about this.
Richiefromboston
Active member
how do you like the magura brake? I just upgraded the silly SLX to XTR on my Rail. Was looking at the magura but have little time with them
Head and shoulders above the Saints I took off. Better feel and could stop a bus!
Smittylube
Member
I put these rotors on my 7 front and rear. The stock brakes didn't line up as I like with a similar bracket, so I 'adjusted ' the bracket.
The stock brakes work excellent with these rotors and well worth the time and $.
Very pleased with the results.
The stock brakes work excellent with these rotors and well worth the time and $.
Very pleased with the results.
It looks like I won’t get the mt7’s until mid July. Levers, callipers, hose/lines, 220mm rotors, spacers, blue-blood etc. I’m gonna give the 4 pad system a try also and keep the original pads as a backup. Apparently the 4 pad system is supposed to be better with the 220mm rotors. (Less noise, better alignment). Kinda makes sense…I think ?. We will see.
Smittylube
Member
what is the 4 pad system?
Richiefromboston
Active member
im guessing the barred owl fan is talking about 4 piston brakes BTW this is my video on Barred owls in Lousiana
Smittylube
Member
I really like the stopping power with the 220’s. With the added weight of the bike as well as the big tires, it’s nice to be able to stop as well as it does now. The 200’s work well, but the 220’s eliminate any questions of stopping power With less effort.
Richiefromboston
Active member
Im 230lbs wear a 15 lb pack minimal all the time and 4 piston XTR brakes and 203mm i can stop at on a dime even wet
Smittylube
Member
True the stock brakes work well, but a larger rotor requires less effort. Mine is the 7 so it does not have xtr, but still 4 piston.
Last edited:
Smittylube
Member
I just spun my wife’s 7 up and down the street and there is a very noticeable improvement from the stock size rotor. Very worthwhile improvement IMO.
Richiefromboston
Active member
for what its worth I put 4 piston XTR brakes fr/rear with 6bolt 203s and my rail stopps like a monster.
Smittylube
Member
True, but the larger rotor requires less effort. For me it helps me ride more relaxed at speed. Stock 7 brakes are 4 piston also.
if I didn’t mention I did 220 both front and rear.
if I didn’t mention I did 220 both front and rear.
Richiefromboston
Active member
piston SLX vs. 4 Piston XTR are day and night not even close, for whats thats worth to you.
Asnowmobiler
Member
Are you using this mount front and rear with 220 rotors? The site I’m looking to buy from says it’s for 220 PM front mount and 180 rear PM. I’m pretty sure I remember seeing they are the same front and rear but not 100% sure.
@Asnowmobiler yeah QM45 front and rear.
MartinD.
Member
Brake much harder and for less time. The rotors will get hotter during the braking phase but cool down quicker when you're off the brakes. Extended applications of lighter braking don't give a chance for the disc/pads/callipers to cool down.
(A useful tip learned from racing cars)
But, cannot argue with the added bling factor.
(A useful tip learned from racing cars)
But, cannot argue with the added bling factor.
Smittylube
Member
I did get an update maybe 2 weeks ago the adapters were back in stock
Asnowmobiler
Member
I ordered everything from Lordgun, they have the M7 pro with rotors and mounts in stock.
Never heard of them, hopefully they are a real company.
Never heard of them, hopefully they are a real company.
Smittylube
Member
Once again I hopped on my wife's bike with stock rotors, Huge difference. Well worth the time and money to do this.
dixie600mhz
Active member
I used the hope HBMP front and rear on my 9.8XT to go 200 to 220mm.
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