Radsport Rosport - no 1 by Martin Böhlig custom frames rahmenbau fahrrad custom bike builder custom bicycles custom bicycle frames
TubingSteel tubes by Columbus & Nova — TIG welded
BrakesCaliper rim — SRAM Red
Tyre clearanceUp to 32 mm
GroupsetSRAM Red Etap
GeometryCustom — sportive
BuiltNuremberg, 2024
Custom geometry TIG Made in Nbg. COLUMBUS Tubing ROSPORT #1 ON-ROAD

NR. #1

Road.
Made to
measure.

Rosport #1 is a road bike that bridges two eras without trying to hide it.

The brakes are caliper rim — clearance up to 32mm, the kind of setup that predates carbon and electronic everything. The shifting is SRAM eTap, fully wireless, no cables to route or barrels to adjust. These two things shouldn’t belong on the same bike. On this one, they feel inevitable.

The geometry is built to go fast. Not aggressive for its own sake, but precise — a frame that rewards commitment and punishes nothing. Internal cable routing runs through the top tube, keeping the lines minimalistic.

The welds is exposed by choice. Each joint is finished by hand to the point where covering it with paint felt like the wrong move. A lacquer will come eventually — when I’m ready to let this bike leave the workshop for a week. Until then, it stays raw.

Handmade in Nuremberg. Every detail deliberate.

The Bike
Close ×
Process
Jigging
Cut
Brazing
Detail
Finish