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technical questions(6 posts)

technical questionscollegiateryder
Dec 26, 2003 6:34 PM
hey guys,

i have two questions so ill just get right down to it:

1) does the tightness of the front or rear skewer have an effect on how freely the wheel rotates? if it helps i have the shimano WH-540 wheelset. im asking because ive noticed that when i have the skewer super tight the wheel seems to lose rotational momentum (possibly to friction between where the fork meets the hub) sooner than when it is somewhat looser. Is this actually happening or does the for engage the hub at a point that doesnt allow for rub against the moving part of the hub?

2) I have a bone stock specialized allez comp (except for the saddle which Specialized needs to work on bigtime!), which in itself is a great bike but i have some cash and i want to upgrade some stuff. it is currently full ultegra, w/ the wheels mentioned in the above question, SLX alloy frame, aluminum handlebars and stem, carbon fork (with alloy steerer) and a carbon seatpost with an alloy? clamp.
If you had the cash what upgrades would you look into first and foremost?

I'm wondering if the performance benefits of a lighter full carbon fork (carbon steerer tube as well) like the ec-90, a set of carbon handlebars and stem, and ultra light tires and tubes outweigh those of a set of really light wheels (compared to what i currently have) like the new high end ksyriums.

i know thats a lot to answer but i appreciate anyone taking the time to respond to even one of those.

happy holidays
re: technical questionsdivve
Dec 26, 2003 6:44 PM
1) It's due to the the hub bearing adjustment. Set it so the wheel turns freely at your preferred skewer tightness.

2)No response available from current source at this point in time.
re: technical questionsLone Gunman
Dec 26, 2003 6:50 PM
In theory, your skewer is pushing against a stationary fixed object (threaded cone nut) and the only compression is on the rubber stop of the skewer. You say "seems", how do you know that the you are providing the same amount of energy to spin the wheel each time? Just a thought.

What is the purpose of the upgrades? Lighter bike? you would probably feel the most difference in a different wheelset. There are plenty of wheels just as good as K's, start with a high end hub like DA and add some quality aero rims like Velocity or Mavic, then high end tires and light tubes. Probably the biggest bang for buck. Also, you did not mention this but, DA STI 9 speed shifters. I would not go to the trouble of the other upgrades. Call me olde skool, any time I have crashed, the bar is the first thing to hit the ground, carbon bars might not survive a good scrapping.
re: technical questionscollegiateryder
Dec 26, 2003 7:51 PM
well, w/ respect to the handlebars, fork, etc... the purpose would be to lighten up the bike, but with the wheels i would be dealing with aerodynamics vs. weight issue. i personally am indifferent because both have obvious benefits, though if pressed id probably go with the lighter wheels because im only 140lbs, and thats not even my race weight, so for me the added stiffness of a really deep rim might cause a handling problem in crits and even winding or windy road races.
re: technical questionsjtlmd
Dec 27, 2003 12:13 AM
1) Overtightening the skewer can cause the cones to be too tight within the hub. You should adjust the cone tightness so that it is not too tight at your preferred skewer tightness. The Park Tool website has good instructions on adjusting the hub

2) I don't think you need to upgrade that bike. It sounds like a good bike. If you want to go faster then train more. If you find there is some part of the bike you don't like, then upgrade that part.
re: technical questionsWoof the dog
Dec 27, 2003 10:03 AM
don't make your front skewer too lose, or you may feel the wheel moving in the fork dropouts up the climbs. I have rear skewer tighter because pedaling puts force on the drive side causing the wheel with a lose skewer to move a bit to the left chainstay.

P.S. forget about carbon steerers, get lighter wheels.

Woof the dog.