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#1
01-10-2021, 04:23 PM
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Please learn me on disc rotors
I've been a 6 bolt guy since I was disc braking before centerlocks arrived. Gonna have a new wheelset built up for an allroad 650b set of wheels. My questions:
- Are the centerlocks the best choice these days? I like the interface vs. 6 bolts. - Road bike, 140 pound rider - 140 front and rear or 160 F / 140 R? - What are the lightweight choices in centerlock? Thanks once again to the amazing hive mind here! 
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#2
01-10-2021, 04:26 PM
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The only thing I can add is the 160/140 front rotor. I'm 126-128lbs and I felt a huge difference from a 140 rotor up to a 160. I personally would not go less than 160 on the front.
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#3
01-10-2021, 04:32 PM
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--Centerlock, with the big lockings (BB tool to tighten) not the free hub/cassette tool.
--140's are pro, but if you are convinced 160s stop better and you are bigger go for it. --Lightest: Shimano RT-MT900
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#4
01-10-2021, 04:34 PM
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6 bolt rules out the top end Shimano rotors and has no place on a road bike. Centerlock hubs can run 6 bolt rotors with an adapter, not the other way around.
140/160 is fine. Sometimes I feel I could get away with 140 in the front but that's marginal at best to me. I'm small and a weight weenie but I wouldn't save weight on rotors, I'd get the best. There's many other places to save weight and not a lot of weight (maybe 20g) to be saved with rotors. To me, the best are the Dura Ace or XTR level ones, with XTR being a few grams lighter with likely identical performance. A few pro teams ran the XTR rotors this year, I assume to save a few grams. Sram have squealed more in my experience, and Shimano tends to warp slightly during/immediately after extended hard braking (like downhill offroad), but return to true after a few seconds. The 2 piece Shimano rotors have been the best and quietest braking of the rotors I've used.
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#9
01-10-2021, 06:32 PM
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Centerlock is the way to go because dealing with six bolts is stupid.
__________________
"I used to be with it. Then they changed what it was. Now, what I'm with isn't it, and whats it is weird and scary." -Abe Simpson
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#10
01-10-2021, 06:46 PM
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Quote:
160f/140r for me. I see zero upside to a 140f. A larger rotor is advantageous for longer descents for sure. SRAM Centerline-X and XR rotors have been great for me. Last edited by ColonelJLloyd; 01-10-2021 at 06:48 PM.
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#11
01-10-2021, 10:01 PM
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This might be considered not quite on topic but it's related to the original question and it's something I've wondered about.
I've seen cases where the 6-bolt hubs have wider flange spacing and taller flanges than the CL versions. Do wider & taller flanges make for stronger wheels, weaker wheels, or is the difference negligible? Thanks.
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#12
01-11-2021, 05:47 AM
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Fwiw I am 80-90lbs heavier and have used 140 up front without any issues. 160 will provide a bit more power and stop a little better, but I don’t recall any issues when using 140/140.
Centerlock looks cleaner to my eye and seems to be the road standard. I did just have a set of wheels built with 6 bolt for my gravel bike, but that was because the hubs I chose were originally for mountain bike use and only come in 6 bolt. Shimano ice tech rotors or Jagwire Pro are my go to center lock rotors. Sent from my iPhone using Tapatalk
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#13
01-11-2021, 06:28 AM
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Quote:
__________________
Chisholm's Custom Wheels Qui Si Parla Campagnolo
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#14
01-11-2021, 08:00 AM
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Quote:
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#15
01-11-2021, 08:16 AM
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When I was young and wrenching a lot in the early 2000s, 6 bolt was standard. I used to hate those shallow little torx heads that always seemed to have just a little bit too much loctite on the threads.
Every disc bike I’ve owned has been CL and I wouldn’t go back, even if you swapped all of my gear out for top of the line stuff.
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