Picked up this great running bike suuuuper cheap. Doesn't need much, but I think the suspension is shot. Front end isn't too bad. I should probably change oil and fork seals at least right? It isn't bouncy, so I'm thinking thats a good sign. Now the rear has that hissing air sound when I bounce my butt on the seat. a big bump will "bottom out" the ride. Not crazy bouncy/springy, but they don't feel "tight". Guessing those are blown. They don't look rebuildable. Who makes a good replacement? Who makes a budget replacement?