The Muc-Off Crank Preload Ring is a super durable, precision CNC machined 7075 piece of hardware. It allows you to precisely adjust the ‘preload’ tension on the bottom bracket bearings. What does this do? It helps to remove the side-to-side play and slack in thru-spindle bottom brackets, to help maximise the life of your bottom bracket bearing, as well as giving you a creak-free ride.

Compatability

Our precision crank pre-load ring fits onto the left crank arm of:

• Mountain bikes
• Gravel bikes
• Road bikes

that have:

• SRAM 30mm spindle cranks
• Race Face 30mm spindle crank
• Easton 30mm spindle cranks
• SRAM DUB 28.99mm Spindles installed

• Precision CNC machined, 7075 aluminium body and threaded adapter ring for a perfect fit
• Stainless steel hardware
• Allows you to precisely adjust the preload tension on the bottom bracket to help extend the life of your bb bearing!

SRAM 30MM SPINDLES

Tools required: Alongside your usual bike tools required to remove your cranks, you’ll also need a bottle of thread lock (Loctite 638 or similar).

1. Place the bike in a bike stand.
2. Either remove the chain completely or remove it from the front chainring.
3. Remove the entire crankset according to manufactures instructions.Loosen the bolt on the OEM crank ring with an appropriately sizedtool.
4. Turn the ring clockwise one full turn.
5. Tighten the bolt.
6. Pull on the crank ring to remove the entire assembly, including thespacer ring.
7. Place the OEM crank ring to one side, this will not be reused.
8. Clean the crank spindle thoroughly using Muc-Off Bio Degreaser.
9. Unbox the ‘Muc-Off Crank Pre-Load Ring’.
10. Slide the appropriate Muc-Off spacer ring onto the crank spindle.
11. Check you have the correct size installed, it should be a tight fit, the spacer ring should not wobble.
12. Remove the spacer ring and apply a small amount of thread lock to the area of the spindle where the spacer ring will be located.
13. Slide the spacer ring back onto the spindle.
14. Wipe away any excess thread lock - Avoid getting any onto thethreads.
15. Rotate the spacer half a turn to ensure good thread lock coverage
16. Leave the thread lock to set for 24 hours.
17. Screw the Pre-Load Ring onto the spacer until it’s finger tight.
18. Reinstall the crankset onto the bike.
19. Unscrew the Preload Ring following the directional arrows, until ittouches the bottom bracket bearing.This does not need to be tight,just enough to stop the crankset frommoving.
20. Tighten the stainless bolt to 3Nm torque with a 2.5mm Hex Key.
21. Give the cranks a spin to ensure everything is moving smoothly. Ifthere is too much resistance, loosen the bolt and back off the Preload Ring slightly.

Periodically spray a protectant such as HCB-1, MO-94 or Bike Spray onto body to ensure there is zero corrosion.

RACEFACE®

Tools required: Alongside your bike tools to remove your cranks you will also require a bottle of thread lock (Loctite 638 or similar) 

1. Place the bike in a bike stand
2. Either remove the chain completely or remove it from the front chainring.
3. Remove the entire crankset according to manufacture instructions. Loosen the bolt on the Raceface crank ring with an appropriately sized tool.
4. Unscrew the existing Raceface preload ring and remove it from the spindle.
5. Place the OEM crank ring to one side, this will not be reused.
6. Clean the crank spindle thoroughly using Muc-Off Bio Degreaser.
7. Unbox the Muc-Off Crank Preload Ring.
8. Screw the Preload ring onto the spacer until it is finger tight. (You will not need a spacer ring.)
9. Reinstall the crankset to the bike.
10. Unscrew the Preload Ring in the direction the arrows shows until it touches the bottom bracket bearing. This does not need to be tight, just enough to stop the crankset from moving.
11. Tighten the stainless bolt to 3Nm torque with a 2.5mm Hex Key
12. Give the cranks a spin to ensure everything is moving smoothly. If there is too much resistance, loosen the bolt and back off the Preload Ring slightly. RACE FACE® is a registered trademark. SRAM™ is a registered trademark.

Periodically spray a protectant such as HCB-1, MO-94 or Bike Spray onto body to ensure there is zero corrosion.