Lower psi in front tire: is this normal?

[Kimmyt]

IMHO if it were a slow leak, you'd have way less than 45 in there 10 days from your last pump (if your starting psi is around 80 as I'm assuming, for a hybrid and compared to your front tire). It might just be gradual air loss from not pumping it up for that 10-day period. I pump every day that I ride. I've lost up to 40 psi in a tire over a DAY, much less 10. If you really want to be hyper vigilant, I don't see why you wouldn't pump on a pre-ride basis.

K.

[Ana]

Thanks for all of your wonderful advice!!

I'll let you know what happens...my tires have been really muddy/ucky lately so I'll rinse them off and take a look...maybe even take out the tube :P I don't have a spare now, though so it will have to hold while I go home tonight I'll pick up a few extra tubes tomorrow

[SouthernBelle]

Do you have a different brand of tube in each tire?

I've noticed differing rates of air loss between brands.

[Ana]

Nope, both tubes are the same brand.

I went into my LBS today to get a replacement Trek grocery bag, as one of the rivet-things came off of it and Trek's warranty covers it for a year but I had to go into an "authorized local dealer" to file the claim

I mentioned the problem and two things came up:

1) maybe I rode over something hazardous (very possible) and should submerge it in the tub or sink to look for bubbles

2) sometimes the little thing inside the shraeder valve (the base of the pointy thing) gets unscrewed a bit....causing a very slow leak.

Soooo I got a new tube and will check my tire....um....tomorrow, maybe

Oh, and I found these great inner tubes made in the U.S. with "slime" in them and they're the same price as the tubes I just got (well, I'm excited).