The Calculated R Series 5 Bolt Mini Spider is for the traditional Factory Mum and Dad’s looking to save weight. CNC’d from 6061 Alloy, it’s a lightweight spider that offers a little more style and strength for when the grom starts laying down the power.

CNC’d from 6061 Alloy
For 5 bolt 110 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 81CRS5BMINIBLK
Brand Calculated Racing