The end of my commute is a 1.5 mile climb. Halfway up it it felt like someone was holding a brake closed on my rear wheel (and since it is a fixed gear with no rear brake, I had no clue what was wrong). The road doesn't have a big shoulder, so I just pushed through and got to the top. When I got there I saw I didn't tighten the bolts enough when I put my rear wheel back on last night and it slipped. I rode 3/4 of a mile uphill with my rear tire rubbing against my frame...I guess that is one way to get a workout though