Re: Frame Building - race bike for next season

Graham Motzing /
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> Lawrence Au Wrote:

> -------------------------------------------------------

> Triangulation my friend...

>

first of all, its pretty great that Larry commented and hopefully he has some more tips as the build progresses. He's a humble guy but has a lot of experience in motorcycle racing, his word is the gold standard.

I'm not even close to the same league but i have done some AHRMA racing experience and modified some vintage bikes for racing, not to mention dirt stuff that is probably more topical.

For my own race moped, i chose a pinto frame because i wanted something lightweight and tube, then i welded on a custom rear seat/shock subframe out of cr-mo tubing which pitched the entire frame forward effectively tightening up the rake because i didn't want to cut the neck and weld- the stock frame is very thin wall and its professionally coped and welded, i didn't trust myself to get it right in my garage, then i used Magnum forks with a 16 inch front wheel mostly because that was stuff i had around and the magnum forks are lighter than other forks and have hydraulic damping.

the tighter rake and trail makes it turn in really nice, it rides very similar to a mini-moto like a kx65 or XR100. i have medium wide MX bars with a mid rise so they end up about 4-5 inches above seat level. Raising up the seat was huge because it lets you get your weight high and forward like a dirtbike or mini.

the thing everyone fucks up with moped racing (i haven't actually done a moped gp event, so take this with a grain of salt) but it seems like people just want to make smaller versions with the same proportions as a motoGP road racing bike. at low speeds and tight stuff, in my experience riding supermoto and dirt, you're better off getting on top of it, just because of how tight everything is on a moped, plus getting the suspension to work right with limited options for parts puts you in a very compromised window.

anyhow, my advice is- start with the rider triangle and work your way back into a design. When i did mine i took photos of the frame and made measurements on the picture to see where i would end up, then i filled in the blanks with the parts i needed to use for practical purposes (forks, wheels, shocks) then i just 'connected the dots' between those parts. My bike looks weird as shit but it works well, hopefully next summer i'll get my program sorted out and make it to a moped GP track to actually compete against people.

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Frame Building - race bike for next seasonTopic by: Dickie Thompson Dickie Thompson 10/16/19 05:43PM
  Re: Frame Building - race bike for next seasonRe: corduroy Swoop corduroy Swoop 10/16/19 06:04PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 10/16/19 06:29PM
  Re: Frame Building - race bike for next seasonRe: Jason Thompson Jason Thompson 11/11/19 05:20AM
  Re: Frame Building - race bike for next seasonRe: Joe Schuitema Joe Schuitema 10/16/19 06:37PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 10/16/19 07:34PM
  Re: Frame Building - race bike for next seasonRe: river 2strokes river 2strokes 10/16/19 07:58PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 10/16/19 08:06PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 11/23/19 06:04PM
  Re: Frame Building - race bike for next seasonRe: river 2strokes river 2strokes 12/06/19 01:50PM
  Re: Frame Building - race bike for next seasonRe: Lawrence Au Lawrence Au 10/16/19 10:51PM
  Re: Frame Building - race bike for next seasonRe: Graham Motzing Graham Motzing 10/17/19 03:55PM
  Re: Frame Building - race bike for next seasonRe: Lawrence Au Lawrence Au 10/17/19 08:14PM
  Re: Frame Building - race bike for next seasonRe: Graham Motzing Graham Motzing 10/18/19 01:30PM
  Re: Frame Building - race bike for next seasonRe: Ryan Graeme Ryan Graeme 10/17/19 12:31AM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 10/17/19 08:24AM
  Re: Frame Building - race bike for next seasonRe: Dave & Bummerzz Dave & Bummerzz 10/17/19 09:56AM
  Re: Frame Building - race bike for next seasonRe: Bas Autowas Bas Autowas 10/17/19 10:14AM
  Re: Frame Building - race bike for next seasonRe: Rebel Moby Rebel Moby 11/11/19 06:11PM
  Re: Frame Building - race bike for next seasonRe: baird co baird co 10/17/19 10:49AM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 10/17/19 10:56AM
  Re: Frame Building - race bike for next seasonRe: river 2strokes river 2strokes 10/17/19 12:14PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 10/17/19 12:27PM
  Re: Frame Building - race bike for next seasonRe: baird co baird co 10/18/19 10:51AM
  Re: Frame Building - race bike for next seasonRe: Anonymous User Anonymous User 10/18/19 03:04PM
  Re: Frame Building - race bike for next seasonRe: P D P D 10/18/19 04:22PM
  Re: Frame Building - race bike for next seasonRe: Lawrence Au Lawrence Au 10/17/19 08:15PM
  Re: Frame Building - race bike for next seasonRe: P D P D 10/17/19 08:29PM
  Re: Frame Building - race bike for next seasonRe: Lawrence Au Lawrence Au 10/17/19 08:36PM
  Re: Frame Building - race bike for next seasonRe: P D P D 10/17/19 10:16PM
  Re: Frame Building - race bike for next seasonRe: jumpsuit steve jumpsuit steve 10/17/19 09:04PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 11/12/19 02:06PM
  Re: Frame Building - race bike for next seasonRe: jumpsuit steve jumpsuit steve 12/02/19 08:14AM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 12/06/19 11:49AM
  Re: Frame Building - race bike for next seasonRe: Dirty30 Dillon Dirty30 Dillon 12/06/19 12:21PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 12/27/19 10:17PM
  Re: Frame Building - race bike for next seasonRe: Daniel '' Daniel '' 12/27/19 11:06PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 12/28/19 08:12AM
  Re: Frame Building - race bike for next seasonRe: baird co baird co 12/28/19 11:59AM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 12/28/19 01:21PM
  Re: Frame Building - race bike for next seasonRe: jumpsuit steve jumpsuit steve 12/29/19 10:55AM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 12/29/19 03:38PM
  Re: Frame Building - race bike for next seasonRe: Daniel '' Daniel '' 12/29/19 04:34PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 12/29/19 04:43PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 01/25/20 03:05PM
  Re: Frame Building - race bike for next seasonRe: Daniel '' Daniel '' 01/25/20 09:19PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 01/26/20 12:50AM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 02/07/20 09:57PM
  Re: Frame Building - race bike for next seasonRe: Ryan Graeme Ryan Graeme 12/29/19 11:53PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 01/27/20 10:23PM
  Re: Frame Building - race bike for next seasonRe: Cristian Luna Cristian Luna 02/08/20 05:25PM
  Re: Frame Building - race bike for next seasonRe: Dickie Thompson Dickie Thompson 02/08/20 05:39PM

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