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I bought an angleset with my bike and had left it at the minimum change (-0.5°) for nearly six months. I was happy with the bike, but thought I'd try it slacker for a change. It's now at -1.5°.
So the important angles are:
[code]
| Offset | Static h/a | Sagged h/a |
------------------------------------
| 0° | 67° | 69° |
| -0.5° | 66.5° | 68.5° |
| -1.5° | 65.5° | 67.5° |
[/code]
Riding the bike on the road to the forest, and up hills didn't seem different at all. Riding downhill seemed a bit less steep (which was nice). And it seemed to smash through rocky/rooty singletrack a little better too. Technical climbing wasn't any harder and I didn't get any more pedal strikes than I usually do ;).
The change was subtle but noticeable. I wouldn't pay [url= http://www.freeborn.co.uk/cane-creek-angleset-headset ]£130[/url] for the change, but was happy enough with the £50 it cost when buying the bike.