STONE 12-Speed Rear Derailleur Pulley Wheel
CNC POM Jockey Wheel | Built for Shimano 12-Speed Chains
Smoother shifts. Quieter rides. Longer chain life. STONE’s CNC-machined POM pulley wheel is engineered to match the Shimano 12-speed chain profile — meaning it works seamlessly across the entire Shimano 12-speed ecosystem, whether you’re running MTB, Road, or GRX.
💡 Key Point: A pulley wheel’s job is to engage the chain — not the shifting mechanism. Because this pulley is built to match 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 just need to pick the correct tooth count (11T/13T) to match 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 & wrap |
| Confusing installation (upper/lower, front/back) | Universal fit — no direction, no 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 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 & 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. Rubber seals block dust, dirt, and moisture. Bearings are replaceable — protect your investment long-term.
Long-Tooth Chain Retention Design 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.
🔧 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 | 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/mud? Clean and re-grease more frequently to prevent rust.
- ⚠️ Less is more — over-greasing can attract dirt.
❓ FAQ
Q: Does this pulley need to match my exact derailleur model (e.g., XTR vs Deore)? A: 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/13T) to your derailleur’s cage size — not the derailleur tier itself.
Q: I’m not sure if I need 11T or 13T — how do I check? A: 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).
Q: Do I need to worry about installation direction? A: No — STONE pulleys are universal for upper/lower position and have no front/back orientation requirement.
Q: How long will the bearing last? A: With proper maintenance (cleaning + regreasing every 300–400km), 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
