Speedline Parts | CNC'd Alloy Mini BMX Racing Cranks

These high-quality billet 7075 aluminum CNC cranks have a decade’s worth of winning heritage behind them. The arms are Precision CNC'd in North America and use a removable 5-bolt spider (included) or the Answer 1-piece chain wheel. We also provide you with the optional Speedline 104mm 4-bolt spider pictured above (sold separately)

The Speedline SX Mini Cranks have the highest strength-to-weight ratio of any mini crank on the market!

Available in: 115, 120, 125, 135, 140, and 145 lengths.

Colors include: Black Anodize with replaceable 4-Bolt Spider.

Fits all Std. JIS Square Taper Bottom Brackets. ( see the Speedline sealed Bearing BB kit to complete your set )

The 145mm set weighs 329 Grams ( 11.6 ounces ) for the 2 Crank Arms, the 4 Arm Spider and the 4 Spider Retaining Bolts.

115mm  266 grams ( 9.4 ounces )

120mm  275 grams ( 9.7 ounces )

125mm  283 grams ( 10.0 ounces )

130mm 306 grams ( 10.8 ounces )

135mm  312 grams ( 11.0 ounces )

140mm  316 grams ( 11.2 oz ounces )

5 Bolt Spider available separately

For larger riders, please check our new 2 pc Forged Aluminum Expert Crank, or our Hollow Carbon Pro BMX Racing Crank.