bdcheung

For my 700x23 tires to lose pressure over the course of a ride / when it's sitting in my apartment?

fmw

You ride while your bike is sitting in your apartment?

DrPete 

Over the course of a ride, no. Over the course of days in the apartment, yes.

The ONLY solution is never to stop riding. Floor pumps are too expensive.

RussB

All bicycle tires loose pressure over time. Even when just sitting. Typically my 700 X 25's drop from about 105 to 85 in about 5 days of sitting. This is because the rubber is porous. If I pump them up and do 50 miles, two days later I'm down 10 pounds. It's normal.

geraldatwork

I find my tires lose between 1-2 lbs a day. About 10 lbs a week. But for whatever reason it seems to vary occasionally within the year. I've lost close to 20 lbs in a week and as little as 5. Same tires same tubes. I don't know if it is strange or not but whatever cycle of change the tires are in, the front and back tires are relatively consistant with each other. Maybe temperature in my garage or air pressure.

bdcheung

The temps here have dropped significantly overnight, so that could contribute to the loss in pressure too.

DrPete 

Not really. Change in ambient temperature shouldn't affect tire pressure too much.

Either way, you should invest in a good floor pump with a pressure gauge and check the tires frequently.

johnny99

The lighter weight the tube, the more air it will lose overnight.

theshoemaker

^^

My current front and rear tubes are magic. They've gone around 800 miles and never needed a patch. [I hope I'm not jinxing the magic by posting this *bites nails*] I pump to a full 120 psi. The rear one takes about 4 days before it's down to about 90, the front one takes about 9 days to get there. Yeah, I'd switch tubes if it's getting low during a ride.

rollin

Wish I could loose 1-2lbs a day :-)

munkyv22

Start riding centuries. That'll get her done.

Snicklefritz

THIEF!!! you stole my line

MrCjolsen

That would have been useful information last week when I decided that I must have had a slow leak because my tires were dropping from 125 to 110 over the course of 3 or 4 days.

You mean I didn't need to remove my tubes and immerse them in water because they were losing that much air?

Miller2

Your car tires do the same thing. It is normal.

spdrcr5

This is quite normal. Temperature has quite a bit to do with this as well. In the winter you lose air faster and in the summer the psi can actually increase if the tires are in direct sunlight. It has to do with how the air molecules are moving around based on the temperature.

Car tires lose their air at the same rate as bicycle tires, it's just that people rarely check their car tires. On a bicycle because the volume of air is so much smaller it is much more noticable when you lose air, or the density changes.

RussB

Car tires don't lose pressure nearly as fast Mostly because they have a different type of rubber (not as porous). But also because of the greater volume and lower pressure.