give me a tweak for any of the demo cars that gives it really big balloony tires. it sounds fun and i want to play with it but i dnt have enugh money to buy s2 yet. but im saving up.

LFS Tweak doesn't work for demo users

The last Tweak version doesn't work for Demo players.
The version before that has tons of tweaks, which you can all find by searching in the Unofficial mods forum.
LFS version X doesn't have a Tweak made for it yet, and W never had one.

you caan load tweaks that other people have made though(i downloaded the xrt v-12 tweak for the xr gt turbo and it works fine)

The Patch Q tweak works for Demo, the Patch U one doesn't - What version are you running?