SRAM Quarq XX1 vs. SRM vs. Sigeyi 8-Bolt MTB Power Meters

The 8-bolt MTB spider for SRAM cranksets is a newer standard from SRAM that is quickly becoming popular. Many manufacturers put SRAM cranks on their mountain bikes and a spider-based power meter is a great way to add power. The SRAM Quarq XX1, SRM SRAM PM9 8-Bolt and Sigeyi AXO SRAM 8-Bolt power meters are feature packed and great options to for your 8-bolt crankset.

Installation is simple and these power meters are accurate, reliable and measure power from both legs. There are also many chainring options for both these power meters, including both round and oval. In addition, they can be used on standard, boost chainlines and super boost bikes.

SRAM Quarq XX1 vs. SRM SRAM PM9 vs Sigeyi AXO SRAM 8-Bolt Comparison Table

	SRAM Quarq XX1	SRM SRAM 8-bolt PM9	Sigeyi AXO SRAM 8-Bolt MTB
Cost	$645	$1,299	$380
Power Measurement	Both legs	Both legs	Both legs
Power Balance	Yes	Yes	Yes
BCD	104	104	104
Chainline Spacing	Standard, Boost, Super Boost	Standard, Boost, Super Boost	Standard, Boost, Super Boost
Communication Protocol	ANT+, BLE	ANT+, BLE	ANT+, BLE
Claimed Accuracy	+/- 1.5%	+/- 1.0%	+/- 1.0%
Active Temperature Compensation	Yes	Yes	No
Weight	114 grams	114 grams	84 grams
Battery Type	CR2032 Replaceable	Rechargeable	Rechargeable
Battery Life	200 hours	100 hours	300 hours
Cadence Measurement	Accelerometer	Accelerometer	Accelerometer
Smallest Round Ring	30T	30T	30T
Smallest Oval Ring	32T	32T	32T
Warranty	2 years	2 years	2 years

Key Differences

While these three power meters are largely similar, the main key difference is price. While the SRM PM9 8-bolt offers a better claimed accuracy and a rechargeable battery, it comes at almost double the cost of the Quarq SRAM XX1. The Sigeyi is the lightest and most affordable, but does not have Active Temperature Compensation. If you’re an SRM fan, you’ll likely love the features of this unit. The Sigeyi is a great option for those looking for an affordable power meter. The Quarq is a well rounded power meter that has great features while maintaining a reasonable price.