Colnago C60 rear brake rub. Stiffer wheels?

[RedRacer]

My set-up is a Colnago C60 58s with DA 9000 brakes, SwissStop Black Price pads and Bontrager Aeolus 5 TLR Clinchers but I am getting bad brake rub/drag when climbing out of the saddle or sprinting.

I previously had the Bontrager cork pads installed and I think they masked the problem because they are so quiet and not at all grabby but with the SwissStop pads I can hear and feel the drag, especially when climbing out of the saddle on inclines greater than ~8%. I have the rear brake adjusted so loose that the lever almost contacts the bars before I get full stopping power. I have also tried three different rear QR skewers just to make sure that isn't the problem.

At this point I think it must either be a soft frame (doubtful!) or a wheel build that just isn't well-suited to this combination of parts and my 80kg.

If this problem is caused by the wheels what are the stiffest sub-1600g 50mm clinchers out there? Probably Lightweight but I am hoping for something a bit less costly.

[beeatnik]

Definitely the wheelz. My rear 24H Archetype rubs on my C59. No rub with my Boras.

[beeatnik]

Opposite load = top of wheel, between pads

[RedRacer]

Re-tension wheels?

Maybe To what tension?

[eric]

Unless the spokes are so loose that they go slack there's no real difference in deflection with spoke tension. See Damon Rinard's wheel tests.

The Bontrager wheels I have seen have a fairly narrow NDS flange spacing. That makes for less unequal spoke tension right/left but makes a flexier wheel. Ways to make a wheel stiffer-

-more spokes
-wider flange spacing
-stiffer larger cross section spokes
-stiffer (larger cross section) rim

One thing I have noticed with out of the saddle climbing is that my pedalling style and how much I rock the bike side to side makes a difference in the amount of brake rub I get. Probably not someting you want to hear (it's not for me!) but you could modify your out of the saddle style...

[pdlpsher1]

Do you have another bike where you could use to see if it rubs with the same wheels? Could there be a defect or crack in the frame that's not visible with the naked eye?


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[RedRacer]

One thing I have noticed with out of the saddle climbing is that my pedalling style and how much I rock the bike side to side makes a difference in the amount of brake rub I get. Probably not someting you want to hear (it's not for me!) but you could modify your out of the saddle style...

Valid point but I think my out-of-the-saddle technique is quite smooth and this brake rub problem hasn't happened on my last five road bikes so I think it is something about the C60 / Bontrager / DA 9000 combo that isn't working...

[XCProMD]

Check the quick release first. Most of the times that's the problem


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[RedRacer]

Check the quick release first. Most of the times that's the problem


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I run my QRs very tight and have tried three different ones (Ti, Ti and heavy steel) with no change

[jimborello]

I had the exactly same problem in an AX Vial Evo with Ciamillo micro G brakes and an enve 6.7 wheelset. I switched the wheels to Bora Ultras and problem solved.