Sat Oct 20, 2012, 03:14 AM

Question for bike geeks.

Had a knee replacment last year and decided to buy a bike to get some strength back. Boought a Police mountain bike because it looked durable and versital.

I had not ridden in 30 years and, although I love my bike, the tires loose most of their air pressure in a matter of a few days. Is this common now? Seems that when I was a kid, I never had to add air to the tires. Or do I just have bad tubes that need to be replaced?

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4 replies	Author	Time	Post
Question for bike geeks. (Original post)	OffWithTheirHeads	Oct 2012	OP
It shouldn't happen. Further investigation is warranted.	PoliticAverse	Oct 2012	#1
It's a brand new, outta the box bike and both front and rear tires do it at almost the same rate.	OffWithTheirHeads	Oct 2012	#2
Is it schrader valve or presta ?	PoliticAverse	Oct 2012	#3
Schrader, and what you say makes sense. I have a Schrader tool and will check for tightness.	OffWithTheirHeads	Oct 2012	#4

Response to OffWithTheirHeads (Original post)

Sat Oct 20, 2012, 04:51 AM

PoliticAverse (5,551 posts)

1. It shouldn't happen. Further investigation is warranted.

Remove the wheels and use a sink or tube full of water to determine where the leak is.

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Response to PoliticAverse (Reply #1)

Sat Oct 20, 2012, 04:57 AM

OffWithTheirHeads (9,066 posts)

2. It's a brand new, outta the box bike and both front and rear tires do it at almost the same rate.

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Response to OffWithTheirHeads (Reply #2)

Sat Oct 20, 2012, 05:03 AM

PoliticAverse (5,551 posts)

3. Is it schrader valve or presta ?

If it is schrader (same valve as car tires) place a drop of water on the valve and see if the leak is there.
(sometimes the valve cores are loose).

Scheader vs presta valve:

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Response to PoliticAverse (Reply #3)

Sat Oct 20, 2012, 07:33 AM

OffWithTheirHeads (9,066 posts)

4. Schrader, and what you say makes sense. I have a Schrader tool and will check for tightness.

But, I take from your reply that air loss is not the new normal.. Common sense tells me you are probably correct about the valves. Thank you!

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