Box One M30-M Crankset - Box®
Box One Oversized M30-M Crankset
Box One Oversized M30-M Crankset
Box One M30-M Crankset - Box®
Box One M30-M Crankset - Box®
Box One M30-M Crankset - Box®
Box One M30-M Crankset - Box®

Box One Oversized M30-M Crankset

$399.99 Sale Save
5 reviews
Size 145mm
Color Black

Only 0 left in stock


All Box One and Two cranksets are engineered and crafted using our Oversized Technology. we all know that there is no use pushing hard on your pedals if you can’t deliver most of that power to the rear wheel. During the creation of our cranks, we were obsessed with Power delivery AKA pedaling stiffness. To reduce lateral deflection at the bottom bracket we chose to enlarge the spindle and the crank arm’s interfaces. We robbed material from unloaded sections to reinforce these zones of high stress. Not only are you going to be more efficient with power delivery, but you’ll also feel the instant response of acceleration. Seen through another lens, less energy will be required to achieve the same elapsed time.

Key differences: The Box One M30 crankset is just as tyrannical as its big brother the Box One M35. Since it's designed for the smaller rider the now 30mm spindle is as extreme to a smaller rider as the 35mm is to a burly world champion. The crank arms are hollow-forged but reduced in size for their application. It is possible to add too much stiffness where the rider will not feel the benefits. Going beyond that point simply adds material which is surplus weight. We’ve removed the stabilizer rings from the spider and removed unneeded material from its legs. These cranks are engineered for the smaller-sized racers.

For compatibility questions, please click here

Oversized Technology™
• Hollow Forged Design
• Large 30mm Alloy Spindle
• Self-Extracting Crank Bolt System

BB86 frames require Praxis™ part 86-4001B or 86-4001W.
BB30/PF30 frames require Praxis™ part 68-4001R or 68-5401R.
T47 frames require Praxis™ part 47-0000.
Do not use pedal washers when installing pedals onto these cranks. M30-M cranks were designed to be used without pedal washers.

Box Two Chainring
Box One Chromoly Chainring Bolts
Box One 7075 Alloy Chainring Bolts
Box Two Oversized bottom bracket M30

• Arms: 7075 T-6 Aluminum
• Spindle: 7075 T-6 Aluminum
• Arms: Hollow-Forged & CNC
• Spindle: CNC Turned
Finish: Anodized w/Laser-Etched Graphics
Chainline: 44.5mm
Q Factor: 153mm
Spindle: 30mm Included
Bottom Bracket: BSA 30mm 1.37 Included
• Chainring: 4-bolt 104 BCD
Size & Weight:
• 145mm / 498g/17.6oz
• 150mm / 509g/17.9oz
• 155mm / 518g/18.3oz

*Weight does not include BB
**Due to the complexity of hollow-forged manufacturing, the weights may vary +/- 10%

Can I use pedal washers with these cranks?
No. These cranks are designed to not use pedal washers. Installing pedal washers can damage the crank as the pedal will not be threaded in sufficiently.

I have a frame with a BB86 bottom bracket shell, will these cranks fit?
Yes, but you will need a BB86 conversion bottom bracket available from Praxis Cycle Works.

Can I use axle or bottom bracket spacers with these cranks?
The cranks are designed to specifically for 68mm wide BMX bottom bracket shells and require no spacers. Spacers may be required if your frame has a bottom bracket shell that is less than 68mm wide.

Can I install my chainring on the outside of the spider?
No. A chainring can only be installed on the inside of the spider.

Can I ride with a loose pedal?
No. A loose pedal will damage the crank and can cause injury. Always ensure that your pedals are tightened correctly.

Customer Reviews
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United States United States

Cranks are amazing

The 30 mm spindle on the m30 cranks has to be the stiffest and smoothest crank I’ve ever rode.

renato p.
United States United States

box one m30 cranks

great as always, service is 5 stars, shipping is 5 stars, product is 5 stars.

James C.
United Kingdom United Kingdom

Box One M30-M Crankset

Absolutely love these Cranks. Please make these in a 160mm

Morten K.
United States United States

Lightest and stiffest on the market

Best cranks on the market for Junior/Expert BMX racers.

Morten K.
United States United States

Best in class

These cranks are the best in class in terms of weight and stiffness. 30 mm spindle and sub 500-grams for the set. Can't be beat.