Rear wheel hop?
10-20-15, 04:04 PM
#26
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Thought this was about a Corvette.
Last edited by Bunyanderman; 10-20-15 at 04:15 PM. Reason: wow, such a spelling fail
10-20-15, 04:54 PM
#27
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Were the wheels trued off the bike without the tires before they were installed on the bike?
If the tires were installed when the wheels were trued, the shop may not have done the whole truing job (trued/checked for side to side only. The shop could have very well created the wheel hop by not truing the wheel/s with the tires and tubes off, or missed seeing the wheel hop if the tires were still on the wheels at the time they were trued..
Of course the wheels should have been rechecked after the tires were mounted and the wheels were back on the bike. But I'm afraid not that many bike shop mechanics go the whole nine yards anymore.
If the tires were installed when the wheels were trued, the shop may not have done the whole truing job (trued/checked for side to side only. The shop could have very well created the wheel hop by not truing the wheel/s with the tires and tubes off, or missed seeing the wheel hop if the tires were still on the wheels at the time they were trued..
Of course the wheels should have been rechecked after the tires were mounted and the wheels were back on the bike. But I'm afraid not that many bike shop mechanics go the whole nine yards anymore.
10-20-15, 05:03 PM
#28
well hello there
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No rim tape necessary on the C24s. So that's probably not it.
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10-20-15, 05:22 PM
#29
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Never in my experience. I've been overlapping the tape for 30 + years.
10-20-15, 05:32 PM
#30
SuperGimp
10-20-15, 05:46 PM
#31
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A wheel needs to be trued in two directions. Horizontally and vertically. It is perfectly possible to true a while so that there is no horizontal movement but still have vertical movement. A good mechanic will know which way to tighten (or loosen) a spoke to ensure the wheel is trued horizontally and vertically.
As others have said, put the bike on a stand and gently spin the wheel looking at the rim in relation to the brake pads. There should be little to no vertical movement (less than 1mm, ideally less than 0.5mm) in the rim. This will also tell you if the tyre is seated properly. Again check to make sure there are no bumps or lumps and that the edge of the tyre is seated properly on both sides.
I, personally, have never felt any hop caused by not having the nut on the valve, overlapping rim tape or the rim joint. Even having a magnet on a spoke doesn't cause a noticeable unbalancing of the wheel. Improperly seated tyres though? Yeah, I have felt that.
10-20-15, 05:59 PM
#32
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They trued the wheel with the tire and tube off the bike. I had not ridden it before they trued it to check for ride quality. When viewing the bike from behind, I cannot notice any vertical movement in the wheel and here is still no horizontal movement.
I already took the tire and tube off and checked to make sure nothing was pinched and that is was seated properly.
I'll take it for a ride and if the issue persists I'll go back to the shop.
I already took the tire and tube off and checked to make sure nothing was pinched and that is was seated properly.
I'll take it for a ride and if the issue persists I'll go back to the shop.
10-20-15, 09:09 PM
#33
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Not necessarily.
A wheel needs to be trued in two directions. Horizontally and vertically. It is perfectly possible to true a while so that there is no horizontal movement but still have vertical movement. A good mechanic will know which way to tighten (or loosen) a spoke to ensure the wheel is trued horizontally and vertically.
As others have said, put the bike on a stand and gently spin the wheel looking at the rim in relation to the brake pads. There should be little to no vertical movement (less than 1mm, ideally less than 0.5mm) in the rim. This will also tell you if the tyre is seated properly. Again check to make sure there are no bumps or lumps and that the edge of the tyre is seated properly on both sides.
I, personally, have never felt any hop caused by not having the nut on the valve, overlapping rim tape or the rim joint. Even having a magnet on a spoke doesn't cause a noticeable unbalancing of the wheel. Improperly seated tyres though? Yeah, I have felt that.
A wheel needs to be trued in two directions. Horizontally and vertically. It is perfectly possible to true a while so that there is no horizontal movement but still have vertical movement. A good mechanic will know which way to tighten (or loosen) a spoke to ensure the wheel is trued horizontally and vertically.
As others have said, put the bike on a stand and gently spin the wheel looking at the rim in relation to the brake pads. There should be little to no vertical movement (less than 1mm, ideally less than 0.5mm) in the rim. This will also tell you if the tyre is seated properly. Again check to make sure there are no bumps or lumps and that the edge of the tyre is seated properly on both sides.
I, personally, have never felt any hop caused by not having the nut on the valve, overlapping rim tape or the rim joint. Even having a magnet on a spoke doesn't cause a noticeable unbalancing of the wheel. Improperly seated tyres though? Yeah, I have felt that.
I've reseated my tire and made sure it is properly seated in the rim and the beads are secure and the tube is not pinched.
I just realized I also have a Garmin speed sensor on my rear hub and am curious to hear thoughts on if that can cause the sensation I am experiencing?
- Again it feels as it there is a slight bump in the road every few feet or so (probably the same place each rotation) which may be a result of the weight offset on my rear hub from the Garmin sensor...
I didn't think the valve nut would make a difference and I will keep it off for now, I didn't notice any rattle the other day on my ride.
I'll ride again in two days and see how it feels, maybe I should take the speed sensor off and test it with and without it...
Thoughts?
10-21-15, 09:13 AM
#35
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I had one of those phantom bumps that I just couldn't figure out. I don't recall what led me to the rim strip but that was what it was; once I trimmed the ends to abut the bump was gone...
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Last edited by rmfnla; 10-21-15 at 04:53 PM.
10-21-15, 11:14 AM
#36
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If the wheel is laterally and vertically true then it is/was the tire mounting. Done. Moving on.
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