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Back 3.15.2017

NAHBS bike profile: A Shamrock Built for Speed

Shamrock Cycles of Indianapolis found its sweet spot in the handmade market building cyclocross bikes. Yet Shamrock owner and builder Tim O’Donnell also loves building road bikes, and he just couldn’t resist building a road racing speed machine for himself.

All Photos © John Watson The Radivist

And he went all out. For last weekend’s North American Handmade Bicycle Show (NAHBS), the blue steel Shamrock on display in the Zipp and SRAM booth was a showcase for cutting-edge road technology:

  • Zipp 454 NSW Carbon Clinchers.
  • Zipp carbon cockpit and seatpost with new stealthy Matte Black finish.
  • SRAM RED eTap wireless shifting.
  • Quarq DZERO Power Meter.

The steel frame is Columbus Spirit with Columbus Life tubing in the chainstay. The blue bike features a distinctive winter-twig like paint scheme thanks to a talented local artist. “I built it specifically for eTap. There’s no braze ons, there’s no holes, nothing.”

O’Donnell added: “It’s a little bit of a steeper head angle. It’s a 73-degree head angle where the bike I had before was 72.5. This is a little bit steep seat tube angle as well.

“I built the bike with a little bit oversized tubing because knowing how I ride, I wanted something that was a little bit stiffer. I’m something of a hammerhead. The oversized tubing certainly worked. It’s traditional road bike geometry but more race oriented vs. all-arounder.”

At NAHBS, the bike featured the Zipp SL-70 Aero and SL Sprint stem with new Matte Black finish. The bar’s wing-shaped aero top and stem’s beefy but light-weight construction blend nicely with the frame’s oversized head tube. The SL Speed seatpost completes the uniform look and helps keep the bike at around 17 ½ pounds even with thinker walled tubing for durability.

“I love the way the bike rides,” O’Donnell said. “It’s very quick handling. It just feels fast.”

Builder: Shamrock Cycles, Indianapolis
Tubing: Columbus Spirit and Life
Wheels: Zipp 454 NSW Carbon Clincher
Tires: Zipp Tangente Course 23mm
Bar: Zipp SL-70 Aero carbon with Matte Black finish
Stem: Zipp SL Sprint carbon with Matte Black finish
Seatpost: SL Speed carbon with Matte Black finish
Drivetrain: SRAM RED eTap
Power: Quarq DZERO
Cassette: SRAM XG-1190
Chain: SRAM RED