Sram Quarq Force Left Arm/Spindle Dub 172.5Mm E1
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What it is
A crank-based power meter that measures how much force you apply when pedalling (watts). It replaces a standard crank spindle and sends data to your cycling computer or watch.
How it works
“Spindle-based unit measures left side power”
- It measures power from one leg (left side)
- Then doubles it to estimate total power output
This is common in mid-range power meters (simpler and more affordable than dual-sided systems)
Key features explained
Proven Quarq reliability
- Uses Quarq technology
- Known for consistent accuracy in real-world riding
???? Trusted in training and racing environments
Long battery life
- Designed to last an entire season on one battery set
- Reduces maintenance and charging hassle
Waterproof (IPX7)
- Can withstand:
- Rain
- Wash-downs
- Temporary submersion up to 1m for 30 min
???? Suitable for all-weather cycling
⚙️ DUB spindle system
- Uses SRAM DUB standard (28.99 mm spindle)
- Works with all SRAM Road DUB bottom brackets
Benefits:
- Stiffer drivetrain
- Better bearing durability
- Simplified compatibility system
Chainline: 45 mm
- Optimised for modern road and gravel frames
- Improves chain alignment and efficiency
What “power measurement” means
It tracks:
- Watts (your actual pedalling force)
- Training intensity
- Fitness progress over time
- Pacing during races or climbs
This is a key tool for structured training (zones, intervals, FTP work)
Pros
- Accurate and consistent power data
- Lightweight compared to dual-sided systems
- Long battery life
- Fully integrated into SRAM Force AXS
- Weather resistant and durable
⚠️ Cons
- Only measures one side (left) → slightly less precise than dual-sided systems
- Expensive compared to non-power cranks
- Requires compatible SRAM DUB drivetrain
- Not usable with Shimano systems
Bottom line
This is a serious training upgrade for performance cyclists using SRAM AXS.
It’s ideal if you want:
- Structured training (watts-based) ✔️
- Race pacing control ✔️
- Reliable long-term data ✔️
But it only makes sense if you’re already committed to a SRAM Force AXS drivetrain and training with power metrics.
