TEST DATA
As the spider does not come with a specific spindle or crankarm model, we can not provide exact savings. The industry average road bike Q factor is 146mm. If we use the SRAM AXS/Quarq 145.5mm Q factor as a reference point for our calculations.
The 15.5mm reduction in Q factor for the narrow spindle equates to a rider dependent saving of 0.0015 to 0.0030m^2. Assuming a standard air density of 1.225kg/m^3 this results in a saving of:
- At 50kph = 2.5-5w
- At 60kph = 4.5-9w
Whereas an 8mm reduction in Q factor for the standard spindle equates to a rider dependent saving of 0.0008 to 0.0016m^2.
- At 50kph = 1.5-2.5w
- At 60kph = 2-4.5w
FITMENT CONSIDERATIONS
Crankarm clearance is an important consideration. Reduced Q-factor is initially achieved through narrowed crankarms, in turn, this reduces the clearance. There is an increased risk of chain strike (between crankarm and chain) when in the smallest sprocket of your cassette. Specifically with the long crankarms, the issue is less likely to be present with the short crankarms. Please refer to the dimension guide and check your fit dimensions.
If you have chain strike we recommend moving spindle spacers to the drive side to reduce the chain angle.
The narrowed crankarms also eliminate 2x compatibility. The space needed for the front derailleur to shift laterally is removed. In some rare instances, you may be able to setup a front derailleur, but generally we suggest the crankarms are used in a 1x arrangement.
WEIGHT
Power2Max Adapter: 7g
WATTS IN THE BOX
- 8x adapter to crankarm bolts (M4x10mm countersunk head bolts)
- 1x adapter
When installing the crankarm bolts use loctite and torque to 4Nm. Torque each bolt in an alternating sequence to ensure even distribution of torque.
