STONE 11T/13T Jockey Wheels for Shimano 12-Speed MTB, Road and GRX Derailleurs
Smoother shifts, quieter rides, longer chain life. STONE’s CNC-machined POM jockey wheel is engineered to match the Shimano 12-speed chain profile, so it works seamlessly across the entire Shimano 12-speed ecosystem — MTB, Road, and GRX.
Key point: A pulley wheel’s job is to engage the chain, not the shifting mechanism. Because this pulley matches the width and pitch of Shimano’s 12-speed chain, it works reliably with any Shimano 12-speed rear derailleur, regardless of tier (XTR, Ultegra, GRX, etc.). You only need to choose the correct tooth count (11T or 13T) for your derailleur cage size.
Why Riders Choose STONE Pulley Wheels
| Common Problem | STONE Solution |
|---|---|
| Noisy, gritty chain running | Smooth POM resin tooth surface matched to 12-speed chain pitch — less friction, less noise |
| Pulley bearings wear out fast | Replaceable, rubber-sealed steel bearings extend service life |
| Chain drops on rough terrain | Long-tooth design improves chain retention and wrap |
| Confusing installation (upper/lower, front/back) | Universal fit — no direction or position guesswork |
| Worried it won’t fit my derailleur tier | Built for the chain spec, not the shifting system — works across the whole Shimano 12-speed range |
Key Features
Precision-Matched to Shimano 12-Speed Chain Geometry
The CNC-machined POM resin tooth profile is designed specifically to match the width and pitch of Shimano’s 12-speed chain — for accurate engagement and minimal friction, regardless of which 12-speed derailleur you’re running.
Quiet and Smooth Performance
POM resin naturally dampens chain noise and vibration compared to standard metal pulleys — ride in near-silence.
Steel Bearing Core, Rubber-Sealed
Built-in steel bearings deliver stable, low-resistance rotation, while rubber seals block dust, dirt, and moisture. Bearings are replaceable, protecting your investment long-term.
Long-Tooth Chain Retention Design
An extended tooth profile keeps the chain locked in, even under extreme chain angles on technical MTB terrain.
Universal, Tool-Free Logic Install
No need to distinguish upper/lower or front/back — just install and go.
Compatibility: One Pulley, Whole Shimano 12-Speed Ecosystem
Because this pulley is engineered around the Shimano 12-speed chain spec, it’s compatible with derailleur cages across MTB, Road, and GRX groups — including:
- MTB 12-Speed: XTR M9200 / M9100 · Deore XT M8200 / M8100 · SLX M7100 · Deore M6200 / M6100
- Road 12-Speed: Dura-Ace R9200 · Ultegra R8100 · 105 R7100
- GRX / Gravel 12-Speed: GRX RX820 · GRX RX610
The only thing you need to choose correctly is tooth count (11T vs 13T) — this is determined by your derailleur cage size, not by your chain or shifting tier.
- 11T → typically fits Road-spec derailleur cages
- 13T → typically fits MTB / Road / Gravel-spec derailleur cages
Not sure? Compare against your original pulley wheel’s outer diameter, or [contact us for sizing help].
Specifications
| Item | Detail |
|---|---|
| Brand | STONE / STONEDW |
| Chain Compatibility | Shimano 12-Speed Chain |
| Teeth Options | 11T / 13T |
| Material | CNC-Machined POM Engineering Resin |
| Bearing | Steel, Rubber-Sealed, Replaceable |
| Thickness | 8mm |
| Hole Compatibility | 4mm / 5mm / 6mm |
| Position | Upper or Lower (No Direction Needed) |
| Application | MTB / Road / Gravel — any Shimano 12-speed derailleur |
Size Guide
| Size | Outer Diameter | Best For (Cage Size) |
|---|---|---|
| 11T | 49.5mm | Road-spec derailleur cages |
| 13T | 57.5mm | MTB / Road / Gravel-spec derailleur cages |
What’s in the Box
- 1 pair STONE pulley wheels
- 1 pair side caps
- Adapter sleeves: 4mm→6mm, 5mm→6mm (6mm bolts need no sleeve)
Installation Guide
- Shift to the smallest cassette cog.
- Release chain tension from the front chainring.
- Remove the original pulley bolt with an Allen key.
- Replace one pulley at a time — never remove both simultaneously.
- Select the correct adapter sleeve for your bolt size.
- Install the STONE pulley onto the derailleur cage.
- Tighten to 3–4 Nm torque.
Maintenance Tips
- Bearings come pre-greased — ready to ride out of the box.
- Add a small amount of grease after the first 50–100 km.
- Recommended maintenance interval: every 300–400 km.
- Riding in rain or mud? Clean and re-grease more frequently to prevent rust.
- Less is more — over-greasing can attract dirt.
FAQ
Does this pulley need to match my exact derailleur model (e.g., XTR vs Deore)?
No. The pulley is designed around the Shimano 12-speed chain spec, which is shared across all Shimano 12-speed groups. You only need to match the tooth count (11T or 13T) to your derailleur’s cage size — not the derailleur tier itself.
I’m not sure if I need 11T or 13T — how do I check?
Compare the outer diameter of your original pulley wheel: 49.5mm = 11T, 57.5mm = 13T. Or check your derailleur’s cage design (Road cages are typically smaller than MTB/GRX cages).
Do I need to worry about installation direction?
No — STONE pulleys are universal for upper/lower position and have no front/back orientation requirement.
How long will the bearing last?
With proper maintenance (cleaning and regreasing every 300–400 km), the sealed steel bearing offers long service life. It’s also replaceable if needed.
Why STONE?
- CNC-precision manufacturing — consistent quality, batch after batch
- Engineered around the chain spec, not locked to one derailleur tier — broader compatibility, less guesswork
- Real steel bearings, not plastic bushings
- Designed specifically for Shimano’s 12-speed chain ecosystem
- Trusted by MTB, road, and gravel riders who want performance without overpaying
