Leaking Tubeless Tires

[carrara.g]

Hello Paceline friends,

I recently converted to tubeless tires on my road bike (inadvertently, I bought new wheels that came with tubeless tires setup). After pouring the 30ML of sealant I turned them as the instructions mentioned. These are the tires: https://www.sigmasports.com/item/Mav...lset-2020/JWH5.

However, I have seen (for the past 6 week) they are losing 30PSI per week/250KM. They go from 105PSI to ~85PSI.

Is this normal?? Any suggestions??

Thanks!!

Gio

[kppolich]

Somewhat normal, check your rim bead and valve stem with soapy water to identify the cause of any larger leaks.

[slambers3]

Originally Posted by carrara.g

Hello Paceline friends,

I recently converted to tubeless tires on my road bike (inadvertently, I bought new wheels that came with tubeless tires setup). After pouring the 30ML of sealant I turned them as the instructions mentioned. These are the tires: https://www.sigmasports.com/item/Mav...lset-2020/JWH5.

However, I have seen (for the past 6 week) they are losing 30PSI per week/250KM. They go from 105PSI to ~85PSI.

Is this normal?? Any suggestions??

Thanks!!

Gio

That sounds normal, even for ordinary tube-type tires. Ever ridden latex tubes? You’ll lose half your pressure or more overnight. Maybe check valve stems, everything is seated and tightened down and if necessary add a little bit more sealant. But losing 20-30lbs over a week seems very normal for high pressure skinny tires.
I check/re-inflate all tires pre ride

[carrara.g]

thanks @slambers3 & @kppolich!! I was hoping it wasn't normal!!

will check valve stems and potentially add a little more sealant.

thanks again.

[party time]

I always find tubeless lose air faster while sitting than tubes. They seem to naturally want to exist at a lower psi =)

[robt57]

Try laying them on sides overnight, next night flip side. Full psi and rotate and move as to get sealant into bead area prior to laying.

Full psi=max recommended for tire...

[2000m2]

My new to me tubeless wheelset loses ~40% pressure in the front over 2 days and about ~90% pressure for the rear tire. I put more sealant in the rear, but same result. I've measured after rides a few times and the rear doesn't seem to lose much over a 2 hr ride, so that's helpful. The difference in how much is lost between front and rear though makes me think something is off on the rear tire.
I'm going to give the "laying on the sides overnight" to see if that helps seal things up a bit more. Next would be soapy water.

[Dave]

High air pressures are usually NOT needed with tubeless. Try the pressure calculator at the ZIPP website. I run pressures in the sixties with my 28mm michelin tubeless on 19mm internal width rims that require no rim tape. Mine hold air as well as a butyl tubed tire. I use orange seal endurance.

[eddief]

I don't think you should be losing that much that fast. Probably leaking through poorly sealed spoke holes. How much do you weigh and why are you running 105 psi?

[SlowPokePete]

I lose up to 5 psi per day.

SPP

[bigbill]

Road bike (25mm) will lose 20# a week at 80#. MTB will lose far less because it starts at a lower pressure.

If you add sealant, do it right before you ride.

[SlowPokePete]

Also, I would never go for a ride without airing up my tires first...tubed or tubeless.

I wanna make sure I'm starting out at the right pressure regardless.

Plus, if a tire is really low it alerts me that something ain't right.

SPP

[Mark McM]

As noted, your rate of air loss isn't unusual, and the narrower the tire and the higher the pressure, the faster will be the loss of pressure.

But I'm also wondering why you using such high pressure? With 25mm wide wheels, you are presumably using tires wider than 25mm, and 105 psi seems excessive. One of the features of the tubeless tires is the ability to use lower pressures. We used to believe that higher pressures make tires roll better, but i recent years we've come to our senses, and use more normal pressures. For 25mm tires, I personally use pressures of 80-85 psi, and for 28mm tires, I'm more like 70-75 psi

[djg21]

Really? Check your tire pressure and pump up your tires before every ride.

[joevers]

105# is far too high, and 30ml too low.

More sealant less pressure.