View Full Version : so i'm back from vacation...

08-13-2005, 12:31 PM
2 weeks up in oregon at the united bicycle institute taking a framebuilding course.


it's super-low, but super-fun...

08-14-2005, 08:36 AM
Looks like fun to me. I like the finish. Tell us all the fun stuff that you learned.

I'm on the tall end and always wanted to build a frame for touring. 90% of the time I go to a store, I don't see any frames that will fit me.

3 Phase Lightbulb
08-14-2005, 09:44 AM
That looks like a wheelie bike I made when I was a kid.. The gearing looks great too. What is the frame made out of? What kind of machine(s) did you use to notch your tubes? How did you end up welding them?

Great job.. Now transfer some of that Knowledge http://bbs.homeshopmachinist.net//smile.gif


08-14-2005, 02:04 PM
another guy in the class made a mtb frame for a dude who's 6'8" tall.

we mitered the tubes on a bridgeport with some holesaws. the welders we used were older miller maxstar 90s and 150s with pulsers added on. the tubes are columbus nivachrom butted bike tubes up front, a cnc turned headtube and bottom bracket shell from solid bikes in sacramento, and plain jane straight gauge 4130 in the back. i used er70s-2 rod to weld it all together and silver soldered the cable stops on...

the gear ratio is 27/10, so it's not low at all. it's a smidge lower than the traditional 44/16 and it's only to have a tiny gear that doesn't get whacked on stuff, not for super low torque...

08-15-2005, 09:08 PM
Kind of unusual to have the chain on the left isn't it?

3 Phase Lightbulb
08-15-2005, 09:39 PM
I think my chain was on the left too... I think I noticed a difference when I moved to the states.. It's been too long ago to remember, but I think U.S. bikes have the spocket on the right side, canadian have the spocket on the left side... I think it was BMX that did this... not sure, don't remember, but I do recall having spockets on both sides and I think it might have something to do with Canada/US (??)


08-16-2005, 01:41 AM
the sprocket side has nothing to do with locale. i run left side drive because i grind on the right. when my sprocket used to be on the right, i'd smash it into ledges and rails and junk and destroy my chain quite frequently...

08-16-2005, 04:23 AM
"...because i grind..."

What's that mean?

I can see a left-side chain being good if you're riding close to a curb.


08-16-2005, 05:26 AM
Do you think this will make Armstrong return for next years tour de France?