Hello, My triangular frame is very stiff and although I have 2" fat tires (@3-4bar) and some seat suspension, I do feel annoying vibrations on some roads. Probably it would help if I went to 2 bar for my tires and a thicker seat cushion. When I first saw the Python project with a front fork used in the back, I thought this couldn't be very stable/safe. The loads are at a 90 degrees angle of what it is designed for. But apparently it works and is strong enough. How does it ride with heavy loads? I thought it would be a bit like a women's bike compared to a men's bike: women's bikes are less stiff and can't really handle heavy loads when cornering. A problem could be kinda like this picture: http://jasondoesitall.com/bikewith2brains/2005704BrokenFork.jpg A front fork is not designed for heavy side loads. That wouldn't be the case for a Python though, it would bend in the other direction. Greetings, Patrick Date: Wed, 23 Feb 2011 12:05:37 +0100 From: dirk@xxxxxxxxxx To: python@xxxxxxxxxxxxx Subject: [python] Re: Rear Suspension Romptekst bericht Hi, if you have a triangle between pivot, seat conection and brake mount/rear wheel, this should be stiff enough even with thin tubing. Also, you could design this triangle with just one tube going round and weld in a normal bike fork which also gives you brake mounts. Standard forks are quite optimised in terms of suspension. A fat rear wheel (which needs less pressure compared to thinner ones) also makes up for a fine suspension with low failure and maintance potential :-) greetings, DirkS Jaculus <jaculusbent@xxxxxxxxx> hat am 23. Februar 2011 um 11:45 geschrieben: > no cracks, but the rear part of the jaculus is way to rigid. Riding > over anything but asphalt gives a headache because of the vibrations. > I would use smaller tubing for the next one, saves weight and improves > the ride. > > For the rear part of a (distant) future brother of the jaculus i was > thinking of two straight tubes from eighter side of the rear axle to > the sides of the pivot. These two should probably be connected just > before the rear wheel (also brake mount) for the top support of the > seat, and at the pivot. > > Jaculus > > 2011/2/23 Jürgen Mages <jmages@xxxxxx>: > > Hello Rod, > > > > it is not a bad idea to leave out the rear suspension. Considering the mount > > of effort, weight and the possibility of failure it seems not really worth > > to include a rear suspension. > > > > So, I am thinking of revising my building side: > > > > http://www.python-lowracer.de/construction.html > > > > The goal is, to simplify the building process and to save weight. > > > > As I never rode unsuspended Pythons, I am curious to hear some experiences > > from you and other riders. Any cracks of the rear frame yet? > > > > Cheers, > > Jürgen. > > > > On 22.02.2011 01:35, r.mccrady@xxxxxxxxxxx wrote: > >> > >> My wheel base is 114cm, with 26" (mountain bike standard) wheels. I > >> built it following the P3 instructions from Jurgen, but I didn't > >> include the rear suspension. > >> > >> -Rod McCrady Los Alamos, New Mexico, USA > > > > ============================================================ > > > > This is the Python Mailinglist > > > > //www.freelists.org/list/python > > > > Listmaster: Jürgen Mages jmages@xxxxxx > > > > To unsubscribe send an empty mail to python-request@xxxxxxxxxxxxx > > with 'unsubscribe' in the subject field. > > > > ============================================================ > > > > > ============================================================ > > This is the Python Mailinglist > > //www.freelists.org/list/python > > Listmaster: Jürgen Mages jmages@xxxxxx > > To unsubscribe send an empty mail to > python-request@xxxxxxxxxxxxx > with 'unsubscribe' in the subject field. > > ============================================================ > http://dirk.steuwer.de