hii was wondering what pressure should i run on a beta rev 3 200 back and front?

03 model

Depends on what type of ground you are riding Tom, I usually run 6-7 in front in the summer and 4-5 in the rear. 3 or less in the mud in the rear and 5-6 in the front. Rocks etc 6-7 in the front and up to 5 in the rear, usually 4.5, you can run lower if you have a Dunlop as it should nt come off the rim easily

the surface is a mix type realy,

there is soft mud,stones,and rocks

so how aout 6 front 5 back think it will work well?

I have a pretty unscientific approach to tyre pressures. Our practise area is similar to the terrain you describe with a mix of big rocks, deep mud, and stone-bedded rivers (frequently all three are found in a single section during trials!) I tend to push on the rim of each wheel with my foot until it looks like there's approximately the right amount of "squash" in the tyres then go and hit a couple of rocks. If it feels like the tyre is hitting the rim, add a bit of air. If it's sliding all over the place, let a bit out. Repeat this process until you have decent grip and front/rear balance. Once you've found this balance you can use a pressure guage to find out the PSI and use this as a baseline for next time. It's worth repeating the test process occasionally though since temperature etc. can make a difference. Obviously, if you're riding predominantly in mud you can run lower pressures but in the end, it's whatever works for you, your riding style and weight and the conditions on the day. In mixed conditions it's always going to be a compromise but if there's going to be a rule of thumb I think it has to be "run as low a pressure as possible without risking damage to the wheels or tyres or upsetting the handling of the bike".

i use 2-3 in rear and 5-6 in the front all the time with a michelin and it seems fine to me, never hits the rim when hitting steps or anything and gives plenty of grip and ive never had a tyre come off the rim yet so im gunna keep using at that

Thanks for the advice. il try some different pressures tomoro

A mate of mine attended one of Dougies trials schools a couple of years ago and somebody asked about tyre pressures.

Apparently Dougs response was " its 6 in the front and 4 in the back whatever you weigh"

I ve used those pressures since the days of Pirelli CRs (before Michelin made good tyres). I'm confident its all I have in common with DL !!

Thanks guys much appreciated