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ScottR400D
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ZZS Bead seating.

I've just been fitting and balancing a new set of ZZS to a new set of rims for a club member mate. 

All straight forward except we couldn't get the beads to fully seat on the front rims. 

He's off to ask Avon what the maximum pressure allowable for seating but just wondered if anyone has had the same issue?

Max pressure marked on the tyre is 44psi so we were loathe to go higher without Avon input  

 

 

Beagler
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Ive seen tyre fitters use ratchet straps to wrap round the middle perimeter  to get them to seal. I expect youve tried this.

2019 310S 1.6 Sigma

ScottR400D
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Yes we tried that but no joy. Broke the bead several times, rotated the tyre, held down the opposite side but always the same part wouldn't seat. Loads of lube. Both front rims the same, rears no problem. 

Fitted lots of ZZRs and never had this issue though the S does seem a heavier tyre. 

L7C
Benton
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Over a year ago had a set of ZZSs fitted by Caterham.  
Found out a couple of days later one of the rears had slightly dropped pressure and through using some soapy water I found it hadn't obviously seated/sealed properly in a couple of areas.

Caterham tried refitting but the problem persisted and so they ended up having to replace it with a new tyre. I assume the original tyre had some kind of manufacturing defect, must happen sometimes.

ScottR400D
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Interesting. I think this maybe different. The tyres were 15mm off seating just hanging up on the edge of the seat. Front of the rims in both cases. 
 

 

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Dixa1225
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Not uncommon to need to put high PSI to get these to seat. Last set I fitted needed 80psi. 

Dixa1225
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Not uncommon to need to put high PSI to get these to seat. Last set I fitted needed 80psi. 

ScottR400D
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#7 that's what I was looking for! Presumably the tyres didn't explode, as you're still here!

As said I was loathe to go so high with someone else's tyres and rims and my body in the firing line!

I'll post what Avon say.   

 

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Dixa1225
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Yep, no issues. The side walls are so stiff on these. We leave them in our paint oven for a couple days before trying to fit.

ScottR400D
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My impression was that they're a lot stiffer than the ZZR, though I thought they were the same construction. 

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rj
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I've been taught to test all new tyres at 4bar (60PSI-ish) to ensure they don't blow in use.

Never had issues with ZZSs though.

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