I use Michelin tubes. I got a bunch of them for $5 each. I'm pretty particular about tubes and generally use only Michelin because I like the stem design. They work well with my pumps. I run GP3000 tyres and they are rated for 120PSI according to the sidewall. I run them a little higher (125 to 130 PSI). Max inflation is generally governed by the tyre and/or the rim. My rims are are rated up to 140PSI.