Triumphrat

lindsayt

So my rear tire has some strange issue right now - I don't seem to be able to get the pin in the valve stem fully compressed with my pump, as it fights me when I try to pump it up. My tire's down quite a bit on pressure (30psi) so I want to get it fixed before it gets so low I can't ride. Front tire's fine, bicycle tires are fine and scooter and car tires are fine, so I know it's the tire, not the pump.

The pump has a built-in pressure gauge, which, when the hose is properly locked onto the valve stem, shows 0 psi until I try to pump it, then it shoots way up and slowly settles back down to the tire's pressure - about 30 psi. My theory is that it's not compressing the pin enough to fully open the valve, but that it is compressing somewhat, so the built-up pressure in the hose when I pump is enough to force the air into the partially-open valve, but it takes much longer than normal.

Ideas? What do I do about it? The bike *is* under warranty but the dealer is in Lakeville and is also slow (several-day turnaround on anything) and I work on my own stuff so I'd rather just fix it.

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2005 Aegean Blue Bonneville - Intiminators and Thruxton preload adjusters up front, Ikon 7613s in the back, otherwise stock
2012 Azzurro Fiat 500 Sport

davidc

I think you'd be well served to get a small power air pump. I bought a small Sears mode - no holding tank, just air pressure. With cars, bike, and the motorcycle, I use it all the time. And, I might add, my rear tire on the Triumph often needs air.

Check a power pump out.

grayghost

Try a different pump??? Maybe the Triumph OEM tubes Schrader valve "pin" doesn't like the pump you are using. Even a bicycle hand pump would only take a few minutes and "elbow grease" to adjust the pressure.

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" My bike pulls to the left......or the right....depending on what side of the road the Tim Hortons is on"

dkreidel

I had the same problem - rear tire too! I had to buy a new tire chuck and it (barely) pushed the valve stem down far enough to fill the tire. I have never seen this before in many, many years of putting air in tires!!

Dick

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'09 T100 50th Anniversary- Togas, Hagons, PC V
'09 T100 green/white- Togas; PC III
'07 T100 tang/opal- Togas, Hagons, Sun rims (18" rear)
'06 Scrambler blue/white - Arrow 2>1; Sun rims 19" F&R, Maxxis DTR
'68 T120R - original owner

doogin

Lindsyat, for what it's worth, I have a cheap electric air pump with built-in pressure gauge. It's gauge shows easily 8psi over what a pencil type gauge shows. Make sure the valve stem is screwed in all the way. How about buying a valve stem core from a parts store.

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Dance with the lady with the hole in her stocking
790 Bonnie Black

Skyblue62

I'd agree with Doogin - get a new valve core

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Ian

BLKTHRUX

Change the valve core.

CAPTDON

My bud & I were ridin. His fttire was rweal low. Tried to fill @ station. nogo. Turns out there was a little tiny O-ring in thevalve stem that kept the air from goin in the titre. Took it out & no problem. Dont know why it was there but it isnt any more & all is well THE END

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CAPT D

HiVel

I had to buy a new chuck and a set of new "guts" (Schrader valves) for the tires. seems like the ones that came on the bike were not very good.
Cheap fix anyhow.

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2005 T100 Bonneville 865cc "Creamsicle"
2007 Tiger "Old Blue"
2004 Thruxton "Big Red"
2006 Sprint ST ABS "The Blue COW"

davidc

Yeah, a new valve might do it. My notion on a pump other than a bike pump was purely out of the need all owners of motor vehicles have, to maintain air pressure for a number good of reasons. Of course a new pump will not fix a faulty tire. I guess I take too much for granted as to who reads my posts.