|   full susp vs hardtail geometry | fullsuspfuture
Nov 27, 2002 12:13 PM | | If you're happy with certain geometry (eff top tube length, seat angle, head angle, wheelbase, etc) on a hardtail with a 70 mm front suspension fork...
And you're looking for a 4" front/back suspension bike for similar riding terrain as your hardtail...
Do you look for the same geometry specs in the full susp? or because the dually will have a taller bottom bracket (or some other trait), do you generally add a bit to top tube length or some other geometry to get a similar feeling bike?
thanks |
| many considerations | derby
Nov 27, 2002 1:39 PM | | It's by far best to demo fullies you are interested in buying.
Starting from a geometry set that you are comfortable with, your effective top tube measurement level back from the head tube should be about the same if your seat post angle is the same. On a lower mono pivot or 4-bar you might steepen the seatpost a half degree to compensate for increased sag while climbing (higher monopivots don't increase sag when climbing).
I think you should go about 1/2 degree slacker in fork angle for every inch more travel (due to dynamic steepening during brake dive). And about 1/8 - 1/4 inch longer chainstay length at sag for every added inch of travel front and rear to balance the increased forward reach of the longer fork. And increase BB height about 1/2 inch for every inch more travel at both ends.
These are rough estimates. You really need to ride a suspension bike for a while and try others to know what works well for you. Or get an expert custom designer to recommend sizing of their own bike, or have them spec a custom fit for you.
- ray |
| thanks, makes sense (nm) | fullsuspfuture
Nov 27, 2002 11:07 PM | | |
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