How far can i lift suspension? how big tires can i fit?

[*albino*batman*]

where is the hub nut? under the freewhel hub cover?

[tom4bren]

where is the hub nut? under the freewhel hub cover?

Yes. There should be a retainer with 3 little phillips head screws under the hub cover (or locking hub if you have them installed). Once that's removed, you can tighten the hub nut enough to load the bearings but still allow the retainer to be re-installed. Just don't tighten it too much or you'll add drag to that wheel.

I know that sounds confusing but I can picture it in my mind since I've done it before. There's a write-up with pictures for re-packing your bearings. Hopefully it's still available in the download section. If not, lemme know & I can post my copy.

Also note that those 3 little phillips head screws are a real PITA & it's easy to strip the heads. An impact driver will probably be needed. I replaced mine with allen pan head screws.