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PostPosted: Thu Jul 28, 2016 4:15 am 
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Joined: Fri Jul 10, 2015 6:48 am
Posts: 36
Assuming you have power meters, then for wheels you own, how much power do you put out before your wheels start to flex laterally?

My inputs:

2015 RSYS clinchers - approx 300W+
2015 BORA 50 tubs - no flex noticable.


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PostPosted: Thu Jul 28, 2016 8:06 am 
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Joined: Wed Jan 22, 2014 11:48 am
Posts: 1473
I can do 1000W without my wheels touching the brake pads?

I'm sure the wheels do flex when I make 1W, but only by a small amount.


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PostPosted: Thu Jul 28, 2016 8:20 am 
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Joined: Sun May 25, 2014 4:57 am
Posts: 855
Bike = SL4 + up to about 90kg rider.
CLX 60 have pushed 1500 through them no rub.
V3 808 Clincher anything over about 1100 pushes the brake track into the chainstay. I just have a sacraficial tape on the inside of the stays now lol.

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PostPosted: Thu Jul 28, 2016 11:34 am 
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Joined: Thu Jun 23, 2016 10:11 am
Posts: 45
Maybe its worth noting the force you push when flex starts. Power is not really a good representation.

Calculator link - http://www.wentec.com/unipower/calculat ... torque.asp

Torque causes flex. This is why all stiffness tests are expressed in mm/degree deflection per Nm

If you compare a sprint at 1000w @ 120rpm to grinding up a +15% climb at 500w @ 60rpm they will both cause the same amount of flex = 79.57Nm

Theoretically you could put 10 000w (@ 1200rpm 8) ) through a wheel set without causing any more flex than the above scenarios

Also if you were to express the Nm you could relate it to stiffness tests and estimate wheel/frame deflection


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PostPosted: Thu Jul 28, 2016 10:52 pm 
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in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 2578
Location: Glermsford, Suffolk U.K
All my wheels dont flex but i build them to be stiff. I climb at low cadence so torque out put high. One soluton to the flex issue is to use a single pivot rear brake as then you can have the pas further fro the rim. Dp rear brakes are quite pointless. Campagnolo know this. SP brake is lighter too.

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PostPosted: Fri Jul 29, 2016 1:05 am 
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Joined: Sun May 25, 2014 4:57 am
Posts: 855
Brake rub isn't my issue unfortunately :(

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