EcoRenovator - View Single Post - Building a pedal power bicycle 12 volt generator, ghetto style

MetroMPG · 01-15-09, 05:38 PM

I wanted the uprights to contact the frame at two points on each side: lower chain stays, and the seat stays.

So I started by putting the bike on a sheet of paper and laying the boards against the bike to find the right width/angles at the base, which I traced out. As a result, the uprights have both negative toe-in and negative camber, to use some car terms:

To keep the thing from collapsing over sideways, I needed to buttress the uprights from the wide base. Triangulate! I checked to see how high I could attach the brace with some string (to make sure my heel cleared it when pedaling):

The chainstays rest in these cradles attached to the inside of the uprights:

Here's the finished stand, from above. Fore/aft stability is provided by that piece screwed to the base that runs underneath and inline with the tire. You can also really see the "toe-in" adjustment in this pic:

It's not quite as strong in the "fore / aft" plane - no triangulation. But it doesn't feel like it needs it. I can add something if need be (I'd like to watch someone else riding it).

And from the rear:

Whole thing took a couple of hours tops, to make, and seems to support the bike solidly with the rear tire about 2 cm off the base.

01-15-09, 05:38 PM	#16
MetroMPG Infrequent noob Join Date: Aug 2008 Location: 1000 Islands region, Ontario, Canada Posts: 402 Thanks: 37 Thanked 20 Times in 19 Posts	Here's how I made the bike stand I wanted the uprights to contact the frame at two points on each side: lower chain stays, and the seat stays. So I started by putting the bike on a sheet of paper and laying the boards against the bike to find the right width/angles at the base, which I traced out. As a result, the uprights have both negative toe-in and negative camber, to use some car terms: To keep the thing from collapsing over sideways, I needed to buttress the uprights from the wide base. Triangulate! I checked to see how high I could attach the brace with some string (to make sure my heel cleared it when pedaling): The chainstays rest in these cradles attached to the inside of the uprights: Here's the finished stand, from above. Fore/aft stability is provided by that piece screwed to the base that runs underneath and inline with the tire. You can also really see the "toe-in" adjustment in this pic: It's not quite as strong in the "fore / aft" plane - no triangulation. But it doesn't feel like it needs it. I can add something if need be (I'd like to watch someone else riding it). And from the rear: Whole thing took a couple of hours tops, to make, and seems to support the bike solidly with the rear tire about 2 cm off the base. __________________ . To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.