Tyre & Tube Change

[mick1836]

Have just changed the knobbly Continental Queen 26" x 2.2 tyres for a pair of 26" x 2.00 Schwalbe Marathon Plus which I fitted and liked on my previous cycle.

When fitting those tyres on my previous bike I had problems getting the tyres to fit centrally on the rims so I took it to a cycle dealer who fitted them and said the problem was I needed to fit new tubes?

Because of the previous problem I also fitted new tubes with presta valves and bought a pair of 26" x 1.5 - 2.1" Halfords tubes.

The first tyre fitted was the front which went on quite easily, the tyre wall indicates inflation pressures between 35 - 70 psi so I was hoping to inflate to 60 psi, however on reaching around 50psi there was a loud bang

and the inner tube with large hole appeared between the rim and tyre.

I then despite the advice fitted the old inner tubes which are 26" x 2.2 - 2.4 and all is well, only inflated to 50 psi so what do you think went wrong?

1. Trapped inner tube?
2. Faulty new inner tube?
3. Inner tube 26" x 1.5 -2.1 to small?
4. Over inflated?

Thanks

 

[lpretro1]

U didn't seat the bead of the tyre properly in the rim - simples - so when you inflated iit the inner tube poked out under the bead and BANG!

 

[Pale Rider]

What age is the bike?

Some older bikes have wide, flat, rims which don't like modern tyres which are designed to fit on narrow, almost V or U-section, rims.

 

[Ajax Bay]

what do you think went wrong?
1. Trapped inner tube?
2. Faulty new inner tube?
3. Inner tube 26" x 1.5 -2.1 to small?
4. Over inflated?

None of the above. Probably what @lpretro1 said, possibly caused by wide rims alluded to by @Pale Rider . Measure between the rim 'inner edges' to find your wheel rim width and check that a 2" tyre is compatible (Schwalbe chart). When inflating tyre, pump a few times and then bounce it round and also visually check that the beads are seated all round both sides.

 

[swee'pea99]

Almost certainly 1. It happens. I did it just the other day, and I must have repaired/replaced several hundred tubes in my time.

 

[Ajax Bay]

OK, OP, what do you mean by 'a trapped inner'. I interpret that as you having trapped the inner with a lever when you struggled to get the M +s on.

 

[Tim Hall]

2 and 3 aren't the cause. If in 1 you mean tube trapped between tyre and rim , then that's a very likely cause. If the rim isn't hooked or the wrong width then 4 is possible. However as the new tyres aren't that far from the width of the old ones, I'd say the rim width isn't an issue.

The bike shop who said new tubes are needed have "interesting" opinions.

 

[Ajax Bay]

The bike shop who said new tubes are needed have "interesting" opinions.

M+s are more likely to go on more easily (I mean less *** difficult) if the inner is on the small side. Talc. So if the previous ones were flabby 2.0-2.5" ones (and we don't know what they were), I think OP's LBS's opinion is valid. If there's an option, go small (ie narrower). Lighter, probably easier to fit, and entirely fit for purpose.

 

[mick1836]

What age is the bike?

Some older bikes have wide, flat, rims which don't like modern tyres which are designed to fit on narrow, almost V or U-section, rims.

The bike is a Cube AMS 130 Pro not sure of it's age possibly a 2012 or 13? Think Cubes age goes by colour or is its year of manufacture within its frame number?

 

[Pale Rider]

The bike is a Cube AMS 130 Pro not sure of it's age possibly a 2012 or 13? Think Cubes age goes by colour or is its year of manufacture within its frame number?

No worries, it's new enough to rule out my flat rims theory.

 

[mick1836]

No worries, it's new enough to rule out my flat rims theory.

Thanks for ALL your replies, phew, my first bike back in the mid 60's was a Royal Enfield with rod brakes,single gear, full metal mud guards, buying parts in those days was so much simpler.

 

[Ajax Bay]

buying parts in those days was so much simpler.

But if you didn't seat the beads and pumped it up quick, an inner blew out just as easily in the 60s as in the teenies (?).