Just had some new wheels built - well new hubs, spokes, rim tape and sealant and used existing carbon rims and tyres.
the rear tyre is losing pressure (from 29psi to circa 12psi) overnight.
Is there an easy way to rectify without taking back to shop which built my wheels as it’s too far just to sort this?
I have a track pump and a CO2 inflator if either are any use?
Thnks
Have you ridden it yet?
Sometimes that's all it needs - riding just gives the tyre a proper coating of sealant.
Check the valve and valve core are properly done up.
Otherwise I'd retape. Use the appropriate width Tesa tape.
The challenge is to find where it is leaking. Sometimes it does just take a ride to seal it all up. Other times it is a nightmare, especially if there is an insert involved. Good luck.
Is there an easy way to rectify without taking back to shop which built my wheels as it’s too far just to sort this?
A wheel builder wouldn't be doing tubeless set-up. And if you supplied second use rims to build from, well they'd just shrug their shoulders and say might be cracked.
Have you ridden it yet?
Sometimes that's all it needs - riding just gives the tyre a proper coating of sealant.
Check the valve and valve core are properly done up.
Otherwise I'd retape. Use the appropriate width Tesa tape.
I've found pressure rarely holds until the wheel has been ridden. if it's losing that much pressure I'd over pressurise it (up to maybe 40/50psi - max the tyres are rated for) and do the old soapy water test. You should be able to tell whether its sidewalls, bead or tape (if airs escaping through the nipples).
New tyre presumably? I find some quite porous (Specialized particularly) so this happens for a while until they’ve been ridden a few times and it will settle down. Unless it’s been taped terribly I’m not sure retaping is necessary until you’ve ridden topped up etc
Can of leak spray or soapy water and a brush.
If it’s leaking at the valve or spoke holes, chances are it’s an issue with the tape.
Valve cores sometimes need a wrap of PTFE.
from 29psi to circa 12psi) overnight.
That's quite a lot. I would rotate the wheel slowly in a partially filled bath until a steady stream of bubbles became obvious.
And yeah as suggested new tyres can be very porous especially if the bike hasn't been ridden or the wheels extensively spun to distribute the sealant.
What make of tyre? Contis used to be notorious for leaking sidewalls and usually needed riding/a second dose of sealant before they’d hold air properly.
What make of tyre? Contis used to be notorious for leaking sidewalls and usually needed riding/a second dose of sealant before they’d hold air properly.
for sure. sidewalls never used to stop weeping - would have a little puddle on the bike store floor where the wheels sat.
whereas current gen Conti's are amongst the least porous tyres I've used.
Looks like the majority are right. I rode the new wheels yesterday for the first time and they now seem to holding air
I used to clean the inside of the old conti tyres with isopropyl to clean the mould release agent before fitting them, otherwise it could take weeks for the sealant to take and start sealing.