Commuting - Tight Hubs = Slow Bike?
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10-10-07, 10:10 PM
After three slow, miserable trips riding to work on my new Trek 7500 hybrid, I was ready to sell it on craigslist and give up commuting forever. Then my roommate told me to check out her Trek mountain bike. It was so fast and easy to ride! So I picked up the back of each bike to spin the back wheels. My back wheel spun sluggishly a few times and stopped. The mountain bike's back wheel spun rapidly for much longer. So I'm guessing my hubs are too tight.
Has anyone else had an experience like this? I obviously know very little about bikes (a few days ago I didn't even know what a hub was), but I didn't have any idea that this could be a problem. I just thought I was incredibly out of shape. So now I'm wondering if I could be right and if so, if other people know about this potential problem. I've since read that many manufacturers overtighten the hubs.
10-10-07, 10:15 PM
A hub adjustment is a fairly minor operation. Sounds like the hubs are too tight. Try loosening the quick release so that it's just barely tight enough. See if the wheel spins freely.
This is not a fix, however, for a tight hub. In fact, a perfectly adjusted hub has just a teensy weensy bit of play that disappears when the quick release is clamped down uber-tight. You have the opposite problem.
Are you sure the brake pads weren't rubbing?
10-10-07, 10:34 PM
You were going to give up after three bad commutes?
lol, give it a chance with your fixed-up bike and you'll see how great commuting is!
my money would be on the brake pads dragging on the rims like Air said. Those go out of adjustment a lot more often and easier than hubs. The wheel could be out of true or not in the dropouts correctly, or the brakes could just need some adjusting.
I tend to check the easier stuff and more common trouble points first.
I agree with checking the brakes. Hubs don't really sem to need that much servicing. Brake pads sometimes do.
1) Hubs usually come from the factory too tight.
2) Even a very tight hub shouldn't cause the type of friction you describe. As noted above, check for other rubbing.
10-11-07, 12:00 AM
new bike? bring it back to the shop and tell them to make an adjustment.
tight hubs can and do exhibit that symptom, but I'm putting money on brake rub.
yah... regardless of the problem, the bike shop should fix it for free if it's new.
10-11-07, 12:14 AM
I've been riding the bus instead. It was so much easier than that bike. :eek: I used my friend's mtn bike today to ride home from work, and it took less than half the time. Wow. Even riding up hills was no big deal.
Hmm, I never looked at the brakes. I'll check it out tomorrow.
I *almost* have the guts to sell my car. I've been using public transportation for the last few months and have saved several hundred on what would have gone to gas. And that's with paying bus fare everyday.
10-11-07, 03:02 AM
It can indeed be hubs that are too tight. Do check the brakes - it's also a likely cause. But don't give up if it's not the brakes. Either way, the bike shop should do the adjustment for you. Make sure you spin the wheel for them and show them that it doesn't spin freely.
10-11-07, 12:36 PM
I had exactly the same problem and it was, in fact, that my hubs were too tight. I loosened them up to the point where they'll stay on the bike, but that's about it. Now the wheel spins freely for quite a while, and I have a much better ride.
10-11-07, 01:42 PM
I briefly checked the brakes this morning. One of the pads is completely flush to the rim. I will take it to the LBS tomorrow and show them.
On a good note, I rode my friend's bike again this morning and it was A.W.E.S.O.M.E.:D
10-11-07, 01:43 PM
PS - Thanks for all the reponses! It's a huge help to know you're all out there and willing to help.
10-11-07, 01:49 PM
give up now, we all need more bicycle-friendly cagers !
10-11-07, 02:27 PM
Have them show you how to adjust it yourself. It is one of the easiest adjustments you can make on a bike.
My Dahon has cup and cone bearing retainers front and back. The cones are adjustable on the threaded axle and should be just tight enough to allow a slight amount of play between the wheel and the axle.
They were HORRIBLY overtightened. You could feel the bearings bind when you turned the wheel.
I just backed off on the cones and the wheel was fine.
According to many people that have posted about this problem, it is widespread. Remember, the people that assemble your bike may not be knowledgeable bicycle mechanics.
...and I got the Dahon from a LBS that I thought would know better!
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