gtadmin wrote:OK, for defintions I found this http://en.wikipedia.org/wiki/Bicycle_and_motorcycle_geometry. But who said wiki was correct ...
After reading about flop, it's effect is reduced on my bike because of the low height of the head tube and low centre of gravity. I think I talked myself into going to a shorter ground trail!
docnjoj wrote:Now you guys have me worried about the rake and trail of Joyces new trike with a front hub motor. Anybody hazard a guess as to the behavior with a 9C stuck on the front wheel. I think the rake is 60 degrees? My guess is that the trail is about 2" but I could be wrong.
docnjoj wrote:Now you guys have me worried about the rake and trail of Joyces new trike with a front hub motor. Anybody hazard a guess as to the behavior with a 9C stuck on the front wheel. I think the rake is 60 degrees? My guess is that the trail is about 3" but I could be wrong.
docnjoj wrote:Trike is due in the bike shop on Friday. Her Bike-e has a similar setup with a front motor and about the same rake and trail as the new trike so the differences should be the "training wheels" and the underseat steering. It is HD (heavy duty) and even thought she doesn't weigh that much it should be hard to break. They claim a load up to 400 lbs is acceptable and she weighs 165 so.................. Sun wouldn't send it to me in a box as their policy is to only have bike shops assemble and test their stuff but my LBS is a good one and they are accepting some "support" from me regarding LocTite and other "hints".
FMB42 wrote:gtadmin writes:
"OK, a couple of posts while writing this. The recommendations from the recumbent site and the Physics Today article had me worried that my geometry would be too stable, and therefore quite difficult to turn. And I gain extra clearance between chain ring and front wheel. I had reduced the wheelbase to an absolute minimum because I need to get it through a turnstile!"
You can also, of course, consider using a larger or smaller diameter wheel as a means of increasing or, in your case, decreasing relative stability.
BTW, I've had Tony Foale's "Motorcycle Handling and Chassis Design" book since the early '80s. This book offers a wealth of information on this topic (I found the "reverse rake leading link designs to be very interesting to say the least).
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