Hummm, Is this true ?

will3

gb155 wrote:

It just dawned on me that they sold me a set of 1.5 nimbus tyres when I bought it and even fitted them for me saying how great they would be for me commuting and yet it was the same guy that said I should use nothing less then tyres sized 2.2 because of my size.

I would have said
"you calling me fat?>" and lumped him*

*not really

gb155

lost_in_thought wrote:

gb155 wrote:

Agent57 wrote:

Pff, no reason to be embarrassed. I bet he's not a TV star!

LOL, To be fair "sorry sir your too much of a fat c**t" Is reason to be a little embarrassed, LOL

TBH, Gaz, the LBS should be embarrassed that they pulled that one on you. I mean, really, shame on them.

The problem was clearly not your weight, it was either the wheel or their set-up, and they should have come clean and admitted it rather than try to feed you some b*llsh*t about your being too heavy.

What was the final outcome regarding the wheel?

Grrrr. This sort of thing makes me really angry, they're just taking a chance that you won't argue back. I get this all the time, especially from car mechanics for some reason.

I'd go back there and give them a piece of my mind. In fact, I've a good mind to go there myself and kick them in the shins on your behalf. Tell them to expect a bearded trucker.

To be honest im pretty pissed with myself for not arguing back now, I could have shot him down at every angle but just wanted to get the hell out of there asap, Maybe that was the plan.

Final out come was its been rebuilt (2 weeks later) but I have been told it wasnt a warrenty issue however as good will they will stand the cost !

car mechanics:Is it coz your a burd maybe ?

I'll let em know Dave the trucker is after the shins of all of em

gb155

will3 wrote:

gb155 wrote:

It just dawned on me that they sold me a set of 1.5 nimbus tyres when I bought it and even fitted them for me saying how great they would be for me commuting and yet it was the same guy that said I should use nothing less then tyres sized 2.2 because of my size.

I would have said
"you calling me fat?>" and lumped him*

*not really

Very bloody tempting

Paulie W

I had a Trek 7500 a couple of years ago and had a constant problem with spokes going on the back wheel (and to a lesser extent the front wheel). Eventually rebuilt it and it was fine thereafter.

vorsprung

Can anyone explain to me how tyre pressure can break spokes???

I realise that for 1.5 wide tyres 80 psi is quite high pressure

The only possible mechanism I could think of was that the high pressure damaged the rim and then the cracked rim made loose spokes and then the loose spokes snapped....which is a bit roundabout

gb155

vorsprung wrote:

Can anyone explain to me how tyre pressure can break spokes???

I realise that for 1.5 wide tyres 80 psi is quite high pressure

The only possible mechanism I could think of was that the high pressure damaged the rim and then the cracked rim made loose spokes and then the loose spokes snapped....which is a bit roundabout

Maybe the higer pressure + weight = more stress on the spokes ?

Aidy

I would imagine that higher pressure would cause more sharp shocks to be transfered to the spokes, and thus cause them to fatigue faster, where a higher volume lower pressure tyre would absorb and distribute more of the impact.

Yes, it's pretty tenuous.

Maybe the higer pressure + weight = more stress on the spokes ?

Spokes are under tension, increased pressure will act to reduce this tension (albeit fairly minimally). Your weight should act to reduce the tension of the vertical spokes and increase the tension of the horizontal ones. Stress (which would cause spokes to sheer, not snap), would really be caused by acceleration or deceleration - you'd have more of it because you're heavier, but tyre pressure should not affect it.

will3

vorsprung wrote:

Can anyone explain to me how tyre pressure can break spokes???

I realise that for 1.5 wide tyres 80 psi is quite high pressure

The only possible mechanism I could think of was that the high pressure damaged the rim and then the cracked rim made loose spokes and then the loose spokes snapped....which is a bit roundabout

The only possible argument is that larger lower pressure tyres smooth out shocks better, so the load cycling on the spokes from road buzz is lower in amplitude and hence should fatigue slower etc.

However, this assumes that the forces that cause spoke fatigue can be eliminated by a softer tyre, which is not necessarily true, in fact it would be a pretty low contributor compared with the cyclic stress as the wheel goes round, unless you're riding on pretty rough terrain.

forgotrafe

vorsprung wrote:

I realise that for 1.5 wide tyres 80 psi is quite high pressure

Is it? 1.5" = 38mm. My 23mm tyres are run at 95 PSI. Roadies often run similar width. or slightly smaller, at even higher pressures (my colleague runs his at something like 120PSI).

Providing 80PSI is within the rating of the tyre and the shop sold those tyres to Gaz for use on that bike (which I understand was the case) then it's still the shops problem.