Drivetrain and Stem Fit Guide
Check the spindle and the chainring mount before anything else. Those two details decide which of our cranks and rings will go on your bike.
Four Things to Check
You can settle fit with four checks, one for each part of the bike.
- Crank: spindle standard and crank length.
- Chainring: 3-bolt or 8-bolt mount, tooth count and offset.
- Stem: bar bore, fork bore or fork type.
- Pedals: the type of riding they are built for.
29mm DUB Boost Spindle
Our ALU crankset and titanium crankset both use a 29mm DUB Boost spindle and the SRAM 8-bolt chainring interface.
The ALU spec lists the spindle as 29 x 100mm. The titanium crank weight of 659g includes the 29 x 100mm spindle and fix ring.
Crank Length
Crank length is listed differently on each model. The titanium crank is 160mm. The EP-D is listed at 155mm for DJI motors. The ALU crank comes in several lengths, so confirm the one you need with us before you order.
Aluminum and Titanium Cranks
The ALU crank is forged, CNC 7075 aluminum with a hollow design, and it weighs 642g. The titanium crank is CNC titanium, optimized for downhill use.
The EP-D is CNC forged 7075 aluminum and fits DJI motors only, so it is not a swap for other bikes.
3-Bolt and 8-Bolt Chainrings
Look at how the ring you have now attaches to the crank and count the bolts. Our 3-bolt ring is for SRAM 3-bolt mounts, and our 8-bolt ring is for SRAM 8-bolt mounts.
Both are CNC 7075 aluminum with hard-anodized coating and a hollow support design.
Teeth and Offset
Offset sets where the ring sits relative to the frame, so check what your crank and frame call for. Size options are not selectable on these listings yet, so email [email protected] with the tooth count and offset you need.
Stems
Our FX stems use a 35mm bar bore and a 28.6mm fork bore. The D-Hybrid is the dual crown choice for downhill.
| Stem | Fit | Bolts or mount |
|---|---|---|
| FX-Ti | 35mm bar bore, 28.6mm fork bore | Titanium bolts |
| FX-SS | 35mm bar bore, 28.6mm fork bore, 40mm center distance | Stainless steel bolts |
| D-Hybrid | 35mm diameter, 50mm length, zero rise | Direct mount or steer tube mount |
See also stem caps and direct mount stems.
Pedals for DH and Enduro
Both of our pedals are 7075 aluminum and built for heavy-duty bikes such as DH and enduro. The ALU Gravity uses an axle-less drop style with an ultra-thin deck.
The Ridge is forged 7075, with a platform shaped for foot support and studs placed around the pressure points.
Check Your Fit With Us
Email us your frame, your crank and what you want to change. We will check it against our specs.
[email protected]