[Closed] Bike geometry question

Hi James!

a longer fork will slacken the head angle. The commonly quoted rule-of-thumb is 1-ish degree per inch-ish raised.

this will (roughly), make descending easier, climbing more difficult.

(but we're only talking a small amount here).

a longer fork will also raise the BB a touch, which might help with crank clearance...

OK thanks but doesn't raising the bars through higher rise/more spacers also make descending easier and climbing harder?

in my experience, raising the handlebars makes everything more difficult. The only reason i've ever done it is for comfort / fit reasons.

most Dh'ers are now trying everything they can to lower their handlebars...

(internal headsets, flat-bars, top-crown-over-the-stem)

How will a longer fork slacken the head angle?
or is there is a diff between head angle and headtube angle?

Diff between the two option James questions, is with the spacers, won't it raise the handlebars vertically, therefore height diff between saddle and bars is changed without raising the front of the frame...err is this where head angles rather than head tube angles come in to play? I'm interested, i'm starting to think about frame geomteries these days.

How will a longer fork slacken the head angle?

As you raise the headtube of the bike from the fork, the bike rotates around the rear wheel as it's axis. Thus the headtube angle gets slacker.

D'oh. of course. The headtube stays at the same angle to the top tube, but the whole thing rotates around the rear axle. Cheers

Different question - is there a difference between raising handlebars with spacers or via higher rise bars?

one is more socially acceptable than the other...

(although if you've got a trimmed to fit steerer-tube, you might not have much choice)

Just aesthetics Bimbler