Wednesday, July 29, 2015

26"

 Ended up making more clearance for the cranks and a bigger sprocket with a yoke. This was the first of its kind, having a bend down the center. The objective was to make the thing as laterally stiff as possible. This frame has good clearance for a huge round profile tire and a 32t sprocket (even at 14.5" CS)

Little short stack 98mm head tube for a tapered steerer

83mm Spanish BB. 



Monday, July 27, 2015

video


This is a hairy line when you're unaware that your tire has a slow leak. Yesterday we were trying to get some new photo angles of the shark fin jump and I folded my tire over on the way out. Luckily, I just bent a pedal when I hit the back of the landing. These old stock Profile "DJ" cranks are the best. I'll take bent pedal spindles over bent cranks anytime.


Tuesday, July 21, 2015

 I made this gusset to counter the stress that likely caused the cracks on this older (random belt drive SS) frame. Apparently when the seat post is long enough, and there isn't sufficient insertion depth, there are stresses in odd places on the seat tube. All of the frames that I see (on the internet) that have had this failure lack any kind of ST-TT gusset.
 Once the list is going a little slower I'll shoot for a batch of my 4" risers. This is my first week on a frame with a short chainstay coupled with a taller bar and it has made manualing a 26" similar to the 24". I used to be on a 2" riser on my DJ bikes and I'll never go back.

Wednesday, July 15, 2015

25.4 clamp, 4" rise, 3 up 7 back



These are going on one of my steel DJ bikes that I got some new parts for. (for which I ordered new parts)

Friday, July 10, 2015

Almost there on a 450mm fork. Just gotta round up an aluminum tube for an insert. The steerer is  2.4mm thick, but the longer legs create more stress.

Wednesday, July 8, 2015

Tire clearance looks tight in this picture, but its .25" all the way around with the big Geax (same size as the Maxxis 2.4 Hookworm). Slammed at 14.9".

Mammoth bars

Got to talking about steel 31.8 bars. Here is one way to do them: 4" rise, 7 back 3 up. The much lighter way to go is to just lathe down an AL adapter shim, but people have been asking for an all steel bar.