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First Bike Frame - This is the first frame I built. All design and fabrication occurred at the Lemelson Center of Hampshire College. Used BikeCAD Pro for frame dimensions and design. Built to my body measurements.
This frame was built to be a durable, highly maneuverable, singlespeed with capabilities for both urban and off-road terrain. The geometry is similar to a mountain bike. The sloping top tube:
1.) Allows for considerable stand over space and therefore increases rider mobility, which contributes to overall maneuverability.
2.) Reduces the dimensions of each triangle, resulting in a stiffer frame and less material.
3.) Shortens the wheelbase, decreasing the turning radius and bike profile.
The rear triangle was built for a 700c wheel and has enough space to fit a 2.5" tire. This provides the option of using a slim racing tire for urban environments or a thicker off-road tire for increased traction during mountain use.
- Columbus Steel tubing
(0.034" wall thickness)
- Double-butted seat tube (1.125")
- Top tube (1.125")
- Down tube (1.25")
- Head tube (1.125)
- Seat stays & Chain stays (0.75")
- 68mm BB
- Surly horizontal dropouts
Used Anvil BikeWorks frame fixture and seat stay mitering fixture. Bridgeport mill. Miller TIG welder. Frame was sandblasted and clear coated.