Advice needed: Schwalbe Marathon rim seating

[KeithC]

Hi folks - first post here and hoping for some guidance!

I have replaced the worn, standard rear tyre on my Brompton with a Schwalbe Marathon. Fitting was easy enough up to a point but I'm struggling with getting the tyre beads to sit properly - a section of the tyre stays stubbornly in the spoke gully.

I tried partially inflating the tyre and manoeuvring the bead but, at the pressures involved, the tube is sitting above the bead and offering no outward pressure on it to keep it in place, so the problem area simply moves round the wheel. Inflating the tyre further prevents any manual manipulation. I went up to 30 PSI, hoping the bead might simply pop out into position - but I have stopped there as having no experience of high pressure tyres on small rims, I don't want to risk damaging the tube.

So, should I simply wind up the pressure until the bead pops into place - like with a tubeless car tyre - or is there some other technique needed here?
Thanks in advance
Keith..

 

[smarttim24]

Had a similar problem tyre would not seat properly and kept almost popping out giving a bulging effect especially around the valve area. Had to resort to a little brut force by partilly inflating making sure the tube not being pinched and then with the flat of hand slapping the tyre round inflating alittle more and repeating the process until fully inflated

 

[Steve Austin]

Use talc. spread talc over the rim/bead of the tyre and inflate until it pops onto the rim.

You'll need to go up to the Maximum recommended tyre pressure, at least!

 

[KeithC]

Use talc. spread talc over the rim/bead of the tyre and inflate until it pops onto the rim.

You'll need to go up to the Maximum recommended tyre pressure, at least!

Thanks Steve. Obviously 30 PSI wasn't providing enough force, given the new tyre rubber was very grippy - with the talc it just eased up onto the rim and by about 70 PSI the tyre was properly seated, with no histrionics.

So, given the source of the talc, the Brompton is now very much a Johnson's baby!

Thanks again