ALUGEAR Shimano 12-speed Inner Chainring 34 36 40T 110 BCD 4-bolt Black
Price:
€36.00
Tax included
Black ALUGEAR inner chainring for Shimano 105 R7100, Ultegra R8100 / R8100-P and Dura-Ace R9200 / R9200-P 12-speed cranksets. Available in 34, 36 or 40T, CNC-machined from 7075-T6 aluminium with a Shimano asymmetric 110 mm 4-bolt BCD. Pair with an ALUGEAR 48, 50, 52, 54 or 56T outer chainring according to the selected gearing combination.
Chainring
ALUGEAR Shimano 12-speed inner chainring – 34, 36 or 40T
This ALUGEAR 2x12 inner chainring completes a double-chainring setup on Shimano 105 R7100, Ultegra R8100 / R8100-P and Dura-Ace R9200 / R9200-P cranksets. It is available in 34, 36 or 40 teeth and should be used with a matching ALUGEAR outer chainring.
CNC-machined from 7075-T6 aluminium, it uses the Shimano road 110 mm asymmetric 4-bolt BCD. Its tooth profile is designed to work with the matching ALUGEAR outer chainring for fast and accurate front shifting on a 2x12-speed drivetrain.
Pair it with the correct outer ring: this inner chainring is designed for ALUGEAR 48/34, 50/34, 52/36, 54/40 or 56/40 setups. The 34T inner ring pairs with 48T or 50T outer rings, the 36T with 52T, and the 40T with 54T or 56T outer rings.
3 sizes
34, 36 or 40T, covering setups from compact 48/34 to speed-oriented 56/40.
Shimano 12-speed
Compatible with FC-R7100, FC-R8100 / R8100-P and FC-R9200 / R9200-P.
26 to 40 g
Very low weight: 26 g for 34T, 29 g for 36T and 40 g for 40T.
Which inner chainring should you choose?
| Inner ring | Matching ALUGEAR outer ring | Combination | Manufacturer weight |
|---|---|---|---|
| 34T | 48T or 50T | 48/34 or 50/34 | 26 g |
| 36T | 52T | 52/36 | 29 g |
| 40T | 54T or 56T | 54/40 or 56/40 | 40 g |
The five combinations to remember are 48/34, 50/34, 52/36, 54/40 and 56/40. The 48/34 option provides easier gearing while retaining a Shimano 12-speed crankset, whereas 56/40 is aimed at riders seeking taller gearing for fast terrain or time-trial use. ALUGEAR's inner-chainring product page simply has not been updated since the release of the 48T and 56T outer rings.
Shimano compatibility
| Crankset | Compatibility | Note |
|---|---|---|
| Shimano 105 FC-R7100 | Yes | 110 mm asymmetric 4-bolt BCD |
| Shimano Ultegra FC-R8100 | Yes | 12-speed double-chainring drivetrain |
| Shimano Ultegra FC-R8100-P | Yes | Compatible with Shimano's integrated power-meter crankset |
| Shimano Dura-Ace FC-R9200 | Yes | 12-speed double-chainring drivetrain |
| Shimano Dura-Ace FC-R9200-P | Yes | Compatible with Shimano's integrated power-meter crankset |
| Original Shimano outer chainring | Not recommended | ALUGEAR guarantees correct double-chainring operation with an ALUGEAR outer ring |
| 1x setup | No | This model is designed exclusively for 2x use |
Technical specifications
- Use: road and time trial.
- Drivetrain: 2x12-speed.
- Position: inner chainring.
- Sizes: 34, 36 or 40T.
- BCD: Shimano 110 mm asymmetric, 4-bolt.
- Shape: round.
- Material: 7075-T6 aluminium.
- Manufacturing: CNC machined.
- Finish: black anodized.
- Weight: 34T: 26 g; 36T: 29 g; 40T: 40 g.
- Chains: Shimano 11- and 12-speed; KMC 12-speed according to ALUGEAR.
- Outer chainring: use with an ALUGEAR 2x12 outer chainring.
- Cranksets: Shimano 105 FC-R7100, Ultegra FC-R8100 / R8100-P, Dura-Ace FC-R9200 / R9200-P.
Velo-Perso.com's view
This inner ring is the logical component for building or upgrading a Shimano 12-speed crankset with ALUGEAR outer chainrings. Its main advantages are the ability to choose your gearing precisely while keeping the original Shimano crank arms, and its remarkably low weight at just 26 g for 34T and 29 g for 36T.
We recommend thinking in terms of a matched pair of chainrings rather than buying the inner ring in isolation: 34T with a 48T or 50T outer ring, 36T with 52T, and 40T with 54T or 56T. These pairings cover a very wide gearing range, from the versatile and accessible 48/34 to the speed-focused 56/40.
Installation recommendations
- Use this inner ring with the matching ALUGEAR 48, 50, 52, 54 or 56T outer chainring.
- Use the intended pairings: 34T with 48T or 50T, 36T with 52T, and 40T with 54T or 56T.
- As with any significant chainring-size change, carefully check front derailleur height, alignment and limit adjustment.
- After any change in chainring size, check front derailleur adjustment.
- ALUGEAR recommends fitting a new chain with new chainrings.
- ALUGEAR guarantees correct double-chainring operation when ALUGEAR inner and outer rings are used together.
Prefer the complete setup?
See the ALUGEAR Shimano 12-speed chainring and AERO cover kit in 48/34, 50/34, 52/36, 54/40 or 56/40.
You can also browse the complete ALUGEAR range at Velo-Perso.
FAQ
Which inner ring should I use with an ALUGEAR 48T outer chainring?
Choose the 34T inner ring for a 48/34 setup. This is one of the current combinations made possible by the introduction of ALUGEAR's 48T outer chainring.
Which inner chainring should I use with a 50, 52, 54 or 56T outer ring?
Use 34T with a 50T outer ring, 36T with 52T, and 40T with either 54T or 56T.
Can I use this inner ring with the original Shimano outer chainring?
ALUGEAR states that this inner ring is compatible with its ALUGEAR outer chainrings and guarantees correct double-chainring operation when both ALUGEAR rings are used together. We therefore recommend keeping the matched ALUGEAR setup.
Is it compatible with a Shimano power-meter crankset?
Yes. It is compatible with Shimano Ultegra FC-R8100-P and Dura-Ace FC-R9200-P cranksets.
Can this chainring be used in a 1x drivetrain?
No. It is an inner chainring designed exclusively for a 2x12-speed drivetrain.
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