Stan's alphas are known for being a bit on the flexy side, but I built them 28 spokes and 2x on the rear and 24 radial on the front, so should be stiff. Spoke tension is at the max without a tyre fitted (and almost completelyeven with a tension meter). Spokes are DT Revs, Tyres are schwalbe ultremo ZX's and michelin ultralight butyl tubes.
Is the flex all in my head? Not sure If I've convinced myself that they're flexing and therefore feel it, or if they're actualy really bad?
Any sure way to tell? Otherwise I'm going out to find a steep hill and disconnect my rear brake and see if it feels any faster.
Before anyone asks, I'm not a modern day Eddy Merckx, but I'm not him from his glory days either, I'm 200lb give or take a rost dinner and not very fit!
Happy to be corrected...
When a wheel is stiff it feels rock solid when out of the saddle sprinting. My Edge 165's for example give an outrageously spongy feeling when sprinting while my shimano C50's on the hand give super solid feedback .
Off the bike try moving the rim sideways towards the brake pads with your fingers. You can see how much it flexs. If the wheel easily touches the brake pads then its too soft.
So, are you interested in knowing if your wheel is stiff, or are you most concerned with whether or not your rim is rubbing the brake pads under high effort?
Expecting my new Pro4 to arrive tires any day now, but we will probably have snow now so it won't be possible to make a test ride either...
In similar spoke and hub build:
-A flexy rim will generally deflect at the road surface from a combo of side load and the spokes being compressed.
-A stiff rim will generally deflect less at the road and instead press the rim at the top of the wheel toward the brake block opposite the road loaded side.
It's the deflection at the road, and the hysteresis / friction that happens constantly (and gets way worse under big load) with very flexy rims that's a lot worse than the brake track rubbing some people notie when they make huge sloppy efforts.
There's a ton of misconception about rim versus wheel stiffness...
CharlesM wrote:There's a ton of misconception about rim versus wheel stiffness...
Yep. Say you have a flexy rim... the rim flexes to the right at the road... it will also flex to the right at the brake blocks. This will be opposite the direction the frame and axle flexes, so may very well *keep* the brake from rubbing rather than cause it.
I raced Zipp 404s and had to open the quick release skewers to keep from getting big brake rub when going hard out of the saddle.
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What else do you want to ask on this forum? Like, is the Pope Catholic?
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.
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Still thicker spokes DS is not a bad idea on any wheelset unless weight reduction is you primary goal.
drchull wrote:I also have been wondering how much difference the skewers make.
If you don't tighten them enough, it can make a lot of difference. KCNC Ti have pretty good clamping force. Ti itself is ~60% of steel's stiffness, but what you need is enough tension in the skewer to keep the dropouts and hub pressed together.
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