Constant low pressure on rear tyre

[pakyrs]

Hi all,

I haven't found a common pattern in the search, and the query that I am sharing might sound incredibly dumb, but this is my first bike with 180 at the rear and the first time I use such bike in a relatively cold country (South of England).

I pumped my tyres a month ago as per manual 36/41 psi. Then monitored with my gauge over the month to observe changes, measures where always taken with the tyre rested and not after a ride (as it will obviously be higher) For context the bike stays in a single brick garage, granted temperature can vary a lot, during the last month we had highs of 24c and lows of 11c perhaps lower at night as well.

Based on the below table, have I got a micropuncture at the rear? And if so could I use slime and sort it? The tyres are not even 1 year old so it bugs the hell out of me to have to change the rear tyre already.



Cheers

P

 

[Redrocket]

I'd say that the rear tyte loses more pressure than mine (based 40 miles N of London). The pressures on both my bikes (tubeless tyres) drop slightly over time but equally can rise if we get a spell of hot weather. Pressures always taken "cold" and with the same gauge.
If you can't find anything in the tyre such as a thorn it could be that the valve is leaking slightly. I assume you always have a valve cap fitted?

 

[miweber929]

I would hesitate to use slime unless absolutely necessary, shops HATE HATE HATE the cleanup afterwards when installing a new tire and instead make sure your valve core and stem are tight and sealed and look the entire tire over for a puncture. 10psi over a month is a small hole.

 

[JRinKtown]

Apart from any issue with the tire, It could be a loose valve core. Check the tightness with a core tool. If tight it still can be the core. Sometimes the seal in the core becomes brittle and loses pressure. In that case a squirt of silicone lube into the stem can freshen it up and cause it to seal again. Worth a shot

 

[Redrocket]

The valve cap should prevent deflation arising from a leaking valve.

 

[pakyrs]

Thanks all, I'll inspection the tyre closely, but I couldn't see anything in particular.

Is this the core tool you mean?

Halfords 4 in 1 Tyre Tool | Halfords UK

Shop the latest The Halfords 4 in 1 Tyre Valve Tool is a very nifty tool indeed at Halfords UK

www.halfords.com

And silicon grease if necessary:

https://www.amazon.co.uk/TETROSYL-LTD-XSG020-Carlube-Silicone/dp/B008AK5QBU/ref=asc_df_B008AK5QBU/?tag=googshopuk-21&linkCode=df0&hvadid=696285193871&hvpos=&hvnetw=g&hvrand=7737825573018073735&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9193987&hvtargid=pla-2281435177418&mcid=6dbc2185c32b3428a233d44b47b4d8c2&hvocijid=7737825573018073735-B008AK5QBU-&hvexpln=74&gad_source=1&th=1

I would rather avoid slime on tubeless, I use it on my bikes with an inner tube and can all be chucked away.

Thanks

P

 

[pakyrs]

Inspected the tyre and found a little hole.

Is there any way to repair this, it's a bummer to have to replace the tyre being new.

Cheers

P

 

[JH09]

this can probably be repaired professionally

Is it OK to plug a tubeless motorcycle tire? - RevZilla

When it's appropriate and safe to repair a puncture in a motorcycle tire, either as a temporary emergency fix or as a permanent repair.

www.revzilla.com

 

[John Jive]

Just pump it up and visit a bike tyre place.
Don't skimp on tyre safety

 

[JDude]

That is about the best case puncture that I’ve seen, definitely repairable. When I had one in a similar spot on the rear it was a half inch tear.

 

[enshiu]

plug it

 

[Redrocket]

Yes, you can't get a more straightforward puncture than that. It's perfectly legal and safe to plug it.

 

[enshiu]

Its not on the verge of the tyre so in the middle just plug it. I have a rubber flap on the rear swing arm to prevent the nail issue

 

[John Jive]

To be hoped it's sorted. Initial post for 21st Sept 👍

 

[pakyrs]

I am running an experiment I'll report back on whether it's dumb or worked.

 

[Traffic]

How do you know that little hole is leaking air?

Go to service station, over pressurise tyre to 50psi then put a dab of spit onto hole, if no air bubble forms then no leak.

I'd be at least doing that before plugging it, plugging tyres is a emergency procedure only and highly dangerous on a motorcycle tyre.

Don't forget to depressurisation the tyre before leaving service station either.

0Failing all that, the only real way to find leak is to remove wheel and submerge it into a tub of water.