Built from 100% 4130 heat-treated and butted chromoly for strength and durability

Single walled aluminium rims laced to a loose ball front hub and semi sealed cassette rear hub are wrapped in park/street tyres to finish

The Diesel chain features mushroomed pins

The steerer tube is CNC'd with increased wall thickness wherever possible

Fly Sierra 18" Frame Size:19mm BB Shell Built from 100% 4130 heat-treatedFly have adapted their Sergio Layos frame to better suit younger riders, the Sierra is an exact replica of that frame that now perfectly fits riders between 7 to 11 years old. The Sierra utilises 4130 CrMo alloythroughout the frame with Japanese Sanko Triple Butted tubing, CNC machined and heat treated headtube and bottom bracket with invest cast dropouts, seatclamp and seatstays. It's built tough for those riders progressing past more inexpensive