P5 rostyle with or without tube?

Spider1175

Spider1175

New Member
Hi,

I got some P5 rostyles (5x15) which will be reworked and put on my P6. The question is now if I need a tube or not. So far I have conflicting statments. My tire shop says no problem without tube while a frined of mine runs his with tube (as the rim has no hump on the inside)

Any recomendations?

Thanks,
Peter
 
From what I've discovered you shouldn't run 'tubeless' marked tyres with tubes as they tyres have internal ribs on that can wear away at the tube and pop it. Getting 'tubed' marked tyres is harder. Equally, without the safety hump in the rim, it's possible to peel the bead away while driving quickly which without a tube results in fairly instant tyre deflation.

In that situation (which I was with some old style Morris minor wheels I was fitting on my Midget) I went without tubes and a bit more pressure. No further info I'm afraid, as I never drove on them because they didn't fit over my brakes.... I was planning to autotest on them.
 
If the wheels don't have the humps one should use tubes, advise from Michelin Technical and my local tyre depot where they had some Original Mini Wheels ( no humps) where the tyres with no tubes had unseated with spirited driving. Conversely Wheels with humps should not have tubes fitted as they can be damaged on initial inflation when the bead jumps over the hump.
 
Back in the day they were never fitted with tubes, I don't quite understand why so many people are thinking they need to have them now.
 
harveyp6 said:
Back in the day they were never fitted with tubes, I don't quite understand why so many people are thinking they need to have them now.
Click to expand...

Hi, I think a lot of it comes from the fact that tyre dealers are populated by the younger generation which are not used to wheels without the hump and think they are dangerous in the event of a puncture. I don't know how they think a deflated tube is going to keep the tyre on the rim. :rolleyes:

I'll stop now because this is a pet hate of mine.

Colin
 
colnerov said:
Hi, I think a lot of it comes from the fact that tyre dealers are populated by the younger generation which are not used to wheels without the hump and think they are dangerous in the event of a puncture. I don't know how they think a deflated tube is going to keep the tyre on the rim. :rolleyes:

I'll stop now because this is a pet hate of mine.
Click to expand...

It's Elf'n'Safety gone mad I tells yer!
 
I´ve just survived my thread regarding humpless rims, so I will not heat it up again ;)
But, are Rostyle rims not made from two parts and riveted togehter ? Which would mean, you should use tubes here for this specific design ?
 
I suppose the reasoning is that back in the day the tyres were not as sticky, and with different construction/sidewall/bead characteristics. When I was investigating internet people were saying that you could peel the tyre away from the bead, which makes a big hole and all the air comes out - this won't happen if the tube is there (and not punctured). If it has punctured (possibly during this scenario) then it'll go down like a balloon with a hole in it.

I eventually decided to run without tubes, but as I said, never got a chance to test them...
 
Thanks for all your answers. I'm probably going without tubes. I hope that after de chroming and powder coating the rims will still keep the pressure.

Regards
Peter
 
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