Tyre troubles

[brit151]

Can anyone let me know what’s gone wrong here? The inner tube seems to be bursting out the tyre which is tearing In a crisscross pattern. Only back tyre seems to be effected. Put a little bit of air in them both a few days ago but didn’t think I’d put much in as I like them not too Hard

Inner tubes I use:


Slime Self-Sealing Inner Tube - 27.5 x 1.90-2.125 - Presta Valve

 

[brit151]

Close up

 

[Deleted member 22539]

That tyre is toast
How old is it ?

 

[soundwave]

https://www.tredz.co.uk/.Schwalbe-Magic-Mary-Addix-U-Soft-Superg-TL-27-5-650b-MTB-Tyre_107014.htm?sku=394787&utm_source=google&utm_medium=cpc&utm_campaign=google_shopping&mkwid=s3UneD2vi_dc|pcrid|43133763773|product|394787|&gclid=Cj0KCQjwttbWBRDyARIsAN8zhbJYorKg3bgpP-iBCIibty7sLzCHuRvkB-dQWKL9aJgP_WmLyssqN5AaAlD5EALw_wcB

the sg has x4 the thickness side walls of the normal ones tho there not cheap.

 

[brit151]

Only 1 year old!!

 

[brit151]

I don’t even go off-road just commute on it. Yea they are a bit pricey.

 

[Deleted member 22539]

Only 1 year old!!

Damn thats not good
Is the bike in the sun alot
They look like 5 + year old tyres

How much pressure have you been running in them ?

 

[brit151]

About 20 psi

 

[brit151]

Only ever in my garage or a shed at work

 

[Deleted member 22539]

It’s definitely an odd one
I would put it down to a bad tyre and move on
Allthou if your running road only maybe go for more of a street tyre next time

 

[Deleted member 22539]

About 20 psi

A bit low especially for street riding maybe the side walls have been twisting to much
Just a thought

 

[anotherkiwi]

That can't be right! Those tyres are made in Germany, not in Indonesia!

<sorry! it is sort of a running joke (bad joke) of mine from another thread on tyre "failure">

 

[Deleted member 4366]

My continental tyres went like that at a very low mileage. Some of their tyres are not suitable for electric bikes and are barely suitable for non-electric ones. You need to get tyres that are specially for electric bikes. Schwalbe make a few. I'm not sure about the other brands.

 

[cyclebuddy]

A bit low especially for street riding maybe the side walls have been twisting to much
Just a thought

I'm no expert, but I'd agree with that. Continental say a recommended pressure of 50psi (maximum 65psi) for X-King 2.2's. I'd say a low pressure of just 20psi is going to distort that sidewall to the point of failure.

Your rolling resistance will be unnecessarily high too - eating into the range you'll get from your battery seeing as you're using your bike for commuting.

If you're deliberately keeping your tyres soft just for comfort, you maybe need to consider suspension on the bike or seat-post instead?

X-King 2-2 tyre spec: www.conti-tyres.co.uk/mtb/x-king-2-2

 

[rower]

You definitely want to invest in some e-bike specific tyres bud. Since changing to Schwalbe Marathon Energizer (https://www.bicyclerollingresistance.com/tour-reviews/schwalbe-energizer-plus-2015) in late January I've not had any tyre drama. I run mine at 4 bar (58 psi if you use new money) which seems to be the sweet spot between efficiency and puncture prevention. The inner tube shouldn't make any odds really - though I prefer schrader valves as then I don't have to faff around converting my track pump when adjusting the pressure on the car wheels or whatever else.

 

[grldtnr]

20 psi ,is way too low, what is happening is that the low pressure is allowing the tyre to creep and ''shuffle' around the rim.

If you took a piece of stiff wire ,twisted in your fingers up and down it will heat up and break, this is effectively what's happened with your tyre, more so ,since it's the back one.

 

[brit151]

Thanks everyone I ended up ordering the same tyre so they still match but will increase the psi so hopefully this won’t happen again. If it does then I’ll look at those ebike specific ones. Didn’t realise those existed ‍

 

[Deleted member 22539]

Thanks everyone I ended up ordering the same tyre so they still match but will increase the psi so hopefully this won’t happen again. If it does then I’ll look at those ebike specific ones. Didn’t realise those existed ‍

Happy to help
And throw some light on the potential issue
Happy peddling

 

[DynatechFan]

Worked in a bike shop for years and that looks like typical overload and/or under inflation damage - 20PSI on a loaded rear tyre is *way* too low, even my ultra lightweight 11 year old daughter runs higher tyres pressures. If it was pot hole or fitting damage it wouldn't all the way round like that. If it was heat build up in the rims it wouldn't be so far on to the sidewalls (though you look to have discs)