Apr 132010

I was in your March [2008] Steel TIG class.

I built my frame to be a time trial or pursuit track bike. I copied a lot of the geometry from a 56cm EAI Bare Knuckle that fits me well. However, I made some adjustments to move the bottom bracket back by about 35mm and up about 30mm. This is a bit counter-intuitive for some, especially those who believe your knee should never be over your toe during your pedal stroke… But, I claim that it depends on when and where you apply your power. This adjusted bottom bracket helps me open up my body to leg angle which I hope gives me a bit more muscle efficiency. Of course, I’ll have to prove this on the track…

Although the first home for this bike is the track, I wanted the option to use it in any sort of fixed gear road event. The increased bottom bracket height from the ground allows me to run slightly bigger cranks (72.5) and still be a bit aggressive on flat corners.. Some worry that this increase in height may be unstable or un-aerodynamic… we’ll see, hopefully these guys will be behind me at the end of the day…

I did discover by accident (not by design) that my special geometry will allow for full bar spins… nice… bonus…

Top Tube: 25.4mm Columbus 8-5-8
Seat Tube/ Down Tube: 28.6mm Columbus 8-5-5
Chain Stay: Kaisei
Seat Stay: Columbus
Surly Track Hooded Rear dropouts

Frame weight: 3.5lbs (un-painted)
Built Bike weight: 15.5lbs

Fork+Stem: Oval Track
Bars: Nitto
Headset: Chris King (of course)
Crank: Sugino 75 (72.5mm crank-arms)

Reynolds Track w/ Phil Wood Hubs for training (tubular)
CaneCreek Sprint 85 for race (tubular)

Paint: Rattle-Can Auto Metallic Black paint, primer, and clear-coat
+ Silver Sheet sticker stock from local hobby shop

 Posted by at 3:17 pm