Showing posts with label post mount. Show all posts
Showing posts with label post mount. Show all posts

Monday, June 01, 2015

Walt finishes something!

It's been an epic week of tonsillectomy chaos (along with: teaching a framebuilding class, selling a house, possibly buying a house, our usual daycare shutting down...) I am finally back at the bench and finished up a couple of frames that have taken *way* too long.

I'll post up just one for now. John's short-stay 29er.


And of course, geometry info, now presented in a nice easy drawing instead of voluminous text. It's got some offset at the dropouts to allow a decent sized tire along with a 34t chainring running at 55mm chainline, and all the usual bells and whistles (but no front derailleur). 




Wednesday, April 15, 2015

Joe's Geometry Jamboree

By popular (ok, one person) request!

Executive summary: short and semi-slack racey bike for attacking the twisties in TX.

New bandsaw says, "I am not impressed"

-69.5 HTA and 90mm trail, designed for a Niner carbon rigid fork or 80-100mm travel suspension
-60.5cm ETT, 66.9cm front center, 107.8cm wheelbase. 
-42cm chainstays, plenty of room for a 2.3 and a 34t oval chainring (lotsa runout on those bad boys - I had to have Joe send me the crank and ring to double check clearances)
-295mm BB height. Just a smidge on the low side if you were running suspension but with a rigid fork you can go a hair lower and Joe likes low.
-Curved seat tube for tire clearance. Joe took it easy on me and let me use straight tubes for the rest of the front end. 
-Built for a nice normal 27.2 post and using nice skinny-ish 35mm/28.6mm down and toptubes for a steel-is-real ride with a little give. Joe is not a huge dude either, so fat tubes were never on the radar.
-Paragon rockers for SS fun if needed, plus chainstay length adjustability.


Monday, April 15, 2013

Quick pic - 140mm postmount

As I guessed earlier, pulley bosses are awesome for making post mount setups. Also, fillet brazing the bosses in does not save any time if you suck at fillet brazing as much as I do, especially once you account for cleaning the flux off the fixture. Doh.


Gold star to whoever figures out what the derailleur cable sticking out of the fork is there for.