back wheel needs truing... again

[kerndog]

Hi - I recently took my bike for a service and had both wheels trued. today I was about to go out for a quick blast and I went to pump up my tyres as I do every ride or so. As I pumped the back one up the valve gave way where it joins the tube and ssssssssssssssss down it went.

So I swapped it out for a spare I have. I pumped it up with my standing pump to the usual 115 psi and as I took of the pump BANG the inner tube blew out. BLOODY HELL! so loud my ears were ringing for ages!. Anyway after some cursing I swapped it out for my last spare and pumped it up, to a bit less that 115psi !

As I put the back wheel back on I noticed that it has a slight wobble again. now Im not sure if it was there before but I know that a few hundred miles ago it was straight as an arrow...

so could the tyre blowing out cause this?

Did the guy at my LBS just not do his job properly?

or do they just go out a lot?

I ride between 50 and a hundred miles a week, haven't hit any pot holes since the last service but do encounter a few speed bumps which I always try to slow down for...

what do you reckon?

cheers!

 

[festival]

Yes it could.
Did he do a good job? It could equally be the general state and quality of the wheel.

 

[Tim Hall]

If the rim is worn, the walls can get pushed outwards by the tyre. Two effects: one, the tyre can blow off the rim and two, the wheel can look out of true.

How old is the rim? How many miles has it done? Is there any noticeable wear?

 

[accountantpete]

TBH , some wheels keep going out of true.

Just get yourself a spoke key.

Find where the wheel is out of true by reference to the brake blocks.

Then loosen the spoke where the wheel drifts out by 1/4 turn and tighten the two spokes on the other side by 1/8th of a turn.

Check the wheel is true or true enough.

Finally place the axle of the wheel on the floor and push down on the rim to get rid of any slightly twisted spokes and re-test.

 

[kerndog]

If the rim is worn, the walls can get pushed outwards by the tyre. Two effects: one, the tyre can blow off the rim and two, the wheel can look out of true.

How old is the rim? How many miles has it done? Is there any noticeable wear?

Hi-the wheels have done about 800 miles and are in good nick I think, it was serviced recently and the guy in the lbs said all was well so no noticeable wear I guess. 800 miles isn't a lot for a wheel to have done is it? Cheers

 

[kerndog]

TBH , some wheels keep going out of true.

Just get yourself a spoke key.

Find where the wheel is out of true by reference to the brake blocks.

Then loosen the spoke where the wheel drifts out by 1/4 turn and tighten the two spokes on the other side by 1/8th of a turn.

Check the wheel is true or true enough.

Finally place the axle of the wheel on the floor and push down on the rim to get rid of any slightly twisted spokes and re-test.

Hi - I did think about having a go at sorting it my self but looked at a few vids and decided it looked a bit scary... Is it really as easy as you say? I it is I may well have a crack at it. Cheers

 

[Andy_R]

Before you start tightening or loosening spokes, spin the wheel and let your fingers lightly ping each spoke as it goes past. They should all ring with the same note. If some are noticebly lower in tone they need tightening, others may need loosening if they ping with a higher note. Once they are all singing the same tune, THEN set about truing the wheel. Your wheel may be out of true already, so start with a bench mark before going any further.

 

[betty swollocks]

Get your wheel rebuilt by an experienced wheelbuilder.
Your inner tube probably went POW because it was not the tyre properly. When pumping a tyre up, stop occasionally to check that it is seated properly and that there is no portion of inner tube sticking out.

 

[Andy_R]

Get your wheel rebuilt by an experienced wheelbuilder.
Your inner tube probably possibly went POW because it was not the tyre properly. When pumping a tyre up, stop occasionally to check that it is seated properly and that there is no portion of inner tube sticking out.

It may have been spokes overly tightened, meaning too much spoke was poking into the rim. Check the rim tape for holes caused by errant spokes.

 

[betty swollocks]

It may have been spokes overly tightened, meaning too much spoke was poking into the rim. Check the rim tape for holes caused by errant spokes.

I would say it was a probability. The OP says the tyre went BANG. No guesses why I believe this to be a probability

 

[Tim Hall]

Hi-the wheels have done about 800 miles and are in good nick I think, it was serviced recently and the guy in the lbs said all was well so no noticeable wear I guess. 800 miles isn't a lot for a wheel to have done is it? Cheers

800 miles is nothing. Some people consider that a good weekend's riding.

 

[kerndog]

800 miles is nothing. Some people consider that a good weekend's riding.

ok cool, as I thought...

thanks

 

[kerndog]

I would say it was a probability. The OP says the tyre went BANG. No guesses why I believe this to be a probability

Hi - so ive checked and theres no spokes poking through... in all honesty I think I over pumped the inner tube and it possibly wasn't seated properly, or in other words (newbie) user error!