The Bigrock Carbon Crank 24mm for SRAM cranks is generally well-regarded for its light weight, improved chainline, and compatibility with SRAM direct mount chainrings, though weight savings over high-end cranks like SRAM Red are modest. Users appreciate the build quality and finish, but note the lack of instructions and potential need for shims.
Pros
- Improved chainline significantly compared to SRAM Red crankset.1
- Compatible with 3-bolt SRAM direct mount chainrings, enabling lighter chainring upgrades.1
- Saves approximately 20 grams compared to SRAM Red GXP crankset.1
- Full carbon crank arms with titanium axle for reduced weight.1
- Finish is great and seems well made.2
- Easy installation with no spacers or adjustment needed on a Tarmac SL8.3
- Good packaging.3
Cons
- Weight saving is not massive or groundbreaking compared to SRAM Red.1
- No instructions included.3
- Graphics are not to everyone's taste; may need to be sanded off.23
- Spider is plain and doesn't match the look of Shimano chainrings.3
- Potential need for shims to ensure spider bolts are tight (question raised).2
Key Facts
- Crank arms and spindle weigh 358g; with spider and bolts 406g (user measured).2
- Complete setup (with spider, chainring, bolts) weighs 454.7g, compared to 475g for SRAM Red GXP setup.1
- Uses a standard 24mm axle and titanium axle.1
- Compatible with 3-bolt SRAM direct mount chainrings.1
- Available in 167.5mm length; user paid $238 CAD with discount codes.2
- Finish is great, carbon weave looks good, simpler graphics than other Chinese carbon cranks.23
- No instructions included.3
Reviews & Ratings
15:22The reviewer mentions the Bigrock cranks as an upgrade installed in a previous video (part one). They state that the cranks were installed with their stock spider and a 4-bolt chainring, which was light but didn't save much weight versus their previous SRAM Red crankset. However, the Bigrock cranks did fix the chainline 'in a quite considerable way.' The reviewer notes the cranks are set up to work with 3-bolt SRAM direct mount chainrings, which allowed them to upgrade to a lighter E13 direct mount chainring for further weight savings and a cleaner look.
16:28The reviewer installs and tests the Bigrock RS carbon crankset from AliExpress as a potential weight-saving and bike-fit upgrade. They compare it to their existing SRAM Red GXP crankset.
Installed on a Tarmac SL8. No spacers, re-used the Ultegra chainrings and no adjustment needed at all. Packaging was good, not a fan of the graphics but couldn't bring myself to sand them off (just yet). Carbon weave looks great. Spider is plain and simple and would have been much nicer if it was a decorative spider that matches the look of the Shimano rings. No instructions. I torqued the 3 bolts to 6.5nm. Please let me know if this is too much, or too little, thanks!
Received mine, finish is great seems well made and simpler graphics than lots of of the carbon cranks coming from chinese manufacturers. I ordered 167.5mm with discount codes on Aliexpress came out to $238 CAD. Crank arms and spindle weigh 358g. With 3 bolts and spider 406g. Will be pairing with Dura Ace 9100 53-39 chainrings for a total weight of approximately 554g. Photos to come. Question for those who have these already, did anyone have to add the provided shims to ensure the spider bolts were tight?
Where to Buy
Bigrock Carbon Crank162.5/165/167.5/170/172.5/175 Cycling Parts 354g Bicycle Crankset For BCD 110 Axis 24mm For Sram Cranks - AliExpress 18
Specifications
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