Rear wheel hop?
 

Hey everyone.

I just purchased a set of dura ace c24 wheels and had my LBS install them a few days ago and there was a slight side to side wobble which they fixed by trueing the wheel.

I took it for a spin yesterday and something felt slightly off. Normally my wheels feel like they spin perfectly with no disruptions. Yesterday was different.

Yesterday my rear wheel felt like t had a slight hop in it at one point in the rotation. It almost felt as if every three feet or so my rear wheel would roll over a slight bump. There is still no side to side wobble on that wheel. Also, if I put the bike in a stand and pedal hard, the bike has a slight bounce to it, something I have not experienced before.

Is this normal? If not, what is likely the cause and how do I go about getting it fixed?

Thanks in advance for the replies.

It is fairly common to notice this on a workstand, but not usually noticable on the road.

Since it feels like it's noticeable on the road could that be indicative of an issue with the wheel?

Is this something that can be caused by valve stems, or would I not feel it on the road?

Spin it slowly on the workstand, and look at the rim from the side. Does it go up & down relative to the brake pads ??

Also, look at the tire. Is there a high or low spot in the tire relative to the rim ? A tire that's not seated properly is more common than a problem with the rim.

it's not usually a defect, just a slight imbalance. There are ways of balancing the wheel. a quick google search will show how.

are these tubular tires or clinchers. Sometimes a poorly glued tubular will hop at the valve.

^ this. In all likelihood, the tire was not seated properly. Let the air out, and then pump the tire up to its max pressure should fix it.

true, but would that explain the bike jumping on the workstand?

These are clincher wheels. I'd assume my lbs would know how to fix it and would have done so as they trued it...

I'll try reseating the tire and see if that fixes it... Didn't think of that. I'll also put it in the stand and check to see if there is any rise in relation to the rear brake...

Thanks!!!

A ham-fisted mechanic could have created a hop by over tightening a spoke or two.

All bikes do that. Wheels are not perfectly balanced, due to the valve and rim joint, but it doesn't matter on a bike.

which is what I said in my first post.

I vote tire

Would all I need to do is flatten the tube and reinstate it? Or should I remove the tire and tube and reseat it completely and reinstall the tube?

It could be, but most times that the bead isn't seated, it will blow off when you ride on it.

And, if the tech over tightened a spoke or a few wouldn't there be horizontal movement on the rear wheel? Which there currently is not.

deflate, pinch the beads together all the way around the wheel, and reinflate(watching the bead area).

yes.

Well I'm grateful for all the quick responses this morning. I hope it's something simple I can do at home. I'll try he suggestion of reseating the tire and reinflating your welcome tube. I'll also try using my valve locks (those little screws that come with the valve to secure it to the rim) and hope that resolves the issue.

It's good to know that it wil always shake a littler in the stand, I'll take it for a spin in the next few days and see if that works!

If the shop replaced the plastic rim strip with cloth and overlapped the ends rather than cutting them so they abut the overlap could cause what you describe...

They kept the blue plastic rim tape in there. Good thought though.

be sure not to tighten these down until the tire is inflated, and the bead is set.

Of course! Thanks for the heads up.

Is it recommended using these or not? I wasn't using them the other day, my first ride using these wheels and tubes... And do they need to be super tight or just to the point where they start giving a little resistance?

Oh, so THAT'S why people were bouncing along by the thousands in years past!

No need to use them, but some use them to keep the valves from rattling.

Don't know if they bounce but I have experienced the slight thump this can produce...