Speedline Parts | CNC'd Alloy Mini BMX Racing Cranks
$ 169.95
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.
Race calendar
Never miss a USABMX national
Add the 2026 USABMX national race schedule to your calendar with one click. Built by Supercross BMX so racers, parents, and fans can keep every national weekend in one place.
Dates are based on the official USABMX national schedule and may be updated if changes are announced. This calendar is a fan/racer convenience tool from Supercross BMX and is not an official USABMX calendar.