RoadBikeReview.com's Forum Archives - General
Ksyrium owners,...(6 posts)
Dec 13, 2001 5:48 AM
|I recently (three months ago) purchased a Trek 5200 from my LBS and upgraded the wheelset to Ksyriums. I noticed that when lifting my bike off the ground after rolling it a few feet,..the rear wheel stops spinning well before the front. Then, I would spin the rear wheel off the ground, and noticed that it definately did not spin as long as other wheels have, given the same amount of "push". Then, while I had the bike in the stand, the rear wheel would spin backwards after spinning the cranks backwards. This was not the case with other low-end bikes in my garage.
Then I met a guy who also had Ksyriums on his bike. He said that he sent his rear back after finding that there was something wrong with his bearings. When he was off the bike and pushing it forward, the cranks would spin forward. Mine does not do that.
My LBS said that my wheel was normal, and that most wheels have different "tolerances",..but all the other lower-end wheelsets I have tested with (other rider's bikes) does not display this type of action.
|Althought I don't have Ks, I know what you're talking about||cyclinseth|
Dec 13, 2001 6:32 AM
|My Hugi rear hub does the exact same thing. It feels like there is too much friction. I was told that the hub needs a while to break in. How long that takes, I do not know. I've also heard that, the hugi at least, is designed to roll more freely under wieght of a rider. That one sounds like bs to me though. Another reason is that the Ks probably have a sealed bearing as opposed to your cheapie wheels which are cone/race. I don't think sealed bearing hubs are as smooth as cone/race hubs|
|Mine are the same. Someone on this board suggested that||bill|
Dec 13, 2001 6:40 AM
|there was some sort of plastic sleeve protecting the bearings or something that created a little bit of friction, maybe. I don't know about that. |
I've been using them for awhile, and they're cool wheels. I do not believe it has slowed me down a whit. Could be that your bearings are tight, but that wasn't the case with mine. Listen for binding.
Dec 13, 2001 2:53 PM
|The K's rear hub has significant spring tension on the palls in the free hub. If the driveline has a low rotational resistance in the bottom bracket, derailleur pulleys, chain, etc. (obviously a good thing), then the spring tension on those palls will be enough to overcome the driveline resistance and the cassette will begin to spin. For instance, the chain resistance can be further reduced by putting the chain on the small chainring and cassette gear and the effect is more apparent. Thus the spinning cranks....|
Dec 13, 2001 5:06 PM
|What you're seeing is the normal way the pawls work - and the results of having cartridge precison bearings with the plastic/metal (embeded in the plastic) seals. You really want to freak out you should see what one of those bearings feels like all by itself. Ultimately it's how everything works under load and the critical thing is to make sure that the bearing adjustment (done with special wrench and wheels mounted in frame) is correct - actaully it's not that critical since the design is so bomber. What you're doing is the bicycling equivalent of kicking tires in the dealer's show room. Get out and ride the wheels - you'll realize how good the setup is. |
BTW - when you see the crank moving when the wheel is rotating all it really menas is that the bike is slowing down when you stop pedaling, but then you knew that right? ;-)
|Thanks to all!! nm||bdacaret|
Dec 14, 2001 4:00 PM