Win the weight weenie wars. When you are looking for the lightest spider on the market the Calculated R Series 4 Bolt Micro Spider is exactly what you are looking for. CNC machined in California from 6061 alloy, the simplistic/minimalist design provides function without the excess.

Lightest 4 bolt spider Available
CNC’d from 6061 Alloy
For 4 bolt 104 BCD chainrings
Compatible with Answer and Calculated style square taper crank arms
Machined In Santa Cruz California
Lifetime Replacement Guarantee
Check out the embedded video to see BMX Ultra chatting with Casey Robinson from Calculated Racing.
SKU 81CRS4BMICRO
Brand Calculated Racing