Strummer DMCA-ULA1 Crank
Direct Mount Alloy Crank – Modular, Lightweight, and Flexible
The Strummer DMCA-ULA1 is an alloy crank with a Shimano Compatible Direct Mount system, designed for riders who want a lightweight, precise crank that is easy to customize for their setup needs.
This crank uses Aluminium Alloy material and a CNC machined process to produce a precise shape, light weight, and clean appearance. The anodized aluminium finish provides a clean look while also helping improve surface durability.
The main advantage of this crank is its modular system concept. The crank arm, spindle, and chainring are separate components, allowing users to choose a setup combination according to their needs, whether for a single chainring, double chainring, or a BCD 104 chainring with an additional adapter.
Key Features
- Modular crank system
- Separate crank arm, spindle, and chainring
- Compatible with Shimano Compatible Direct Mount Chainring
- Can be used for a single chainring or double chainring setup
- Compatible with a BCD 104 chainring with an additional adapter
- CNC machined for precise results
- Aluminium Alloy material
- Anodized aluminium finish
- Lightweight, approximately 415 grams for the left and right crank arms
- Easier to upgrade and more repairable because the main components can be replaced separately
Modular & Repairable Concept
The Strummer DMCA-ULA1 is designed with a modular concept, so users are not locked into just one crankset configuration.
With this system, users can choose the crank length, spindle, and chainring according to their needs. If currently using a single chainring, users will still have the option to switch to a double chainring in the future without having to buy a new crankset.
The separate component system also makes this crank more repairable. If a specific component needs to be replaced, users do not have to replace the entire crankset.
Crank Length Options
| Crank Length | Specifications |
|---|---|
| 165 mm | Suitable for riders who want a higher cadence or safer pedal clearance |
| 167.5 mm | Middle option between 165 mm and 170 mm |
| 170 mm | Common size for road, gravel, and MTB |
Product Weight
| Specifications | Details |
|---|---|
| Crank Only Weight | ±415 grams |
| Weight Contents | Left and right crank arms |
| Note | The weight difference between crank lengths is not significant |
Package Contents
| Components | Quantity |
|---|---|
| Right crank arm | 1 pc |
| Left crank arm | 1 pc |
| Ø29 × 0.5 mm Spacer | 2 pcs |
| Ø29 × 1 mm Spacer | 1 pc |
| Ø29 × 2 mm Spacer | 1 pc |
| Spring Washer | 1 pc |
| Plastic Lock Washer | 2 pcs |
| Ø29 mm Spindle Lock | 1 pc |
Note: The chainwheel image is for illustration purposes only. The purchase includes only the left and right crank arms and the small parts listed in the package contents section. The chainring, spindle, bottom bracket, and adapter are sold separately unless specifically stated otherwise.
Chainring Compatibility
The Strummer DMCA-ULA1 crank is compatible with the Shimano Compatible Direct Mount System chainring.
Examples of Compatible Chainrings
Strummer DMCR-SHM-ULA1 Ultralight AL-7075 Chainring
Shimano Compatible Direct Mount
| Size | SKU |
|---|---|
| 32T | CRING-00050BKCNC |
| 34T | CRING-00051BKCNC |
| 40T | CRING-00052BKCNC |
| 42T | CRING-00053BKCNC |
| 52/36T | CRING-00048BKCNC |
| 53/39T | CRING-00049BKCNC |
Spindle Compatibility
This crank is compatible with a Strummer spindle with a diameter of 29 mm.
| Product | Size | SKU |
|---|---|---|
| Strummer DMSP-SHM29-ULA Road Ultralight Spindle | 125 × 29 mm | AS-00034SL |
| Strummer DMSP-SHM29-ULA MTB Ultralight Spindle | 129 × 29 mm | AS-00033SL |
Note: The spindle option should be selected according to the required chainline, bottom bracket width, and frame type.
Adapter Compatibility
To use a BCD 104 chainring, this crank can be paired with the following adapter:
| Product | SKU |
|---|---|
| Strummer ADTCR-104-SHM Chainring Adapter for Shimano Direct Mount | ADT-00079BK |
This adapter allows users to use a chainring with the BCD 104 standard on the Strummer DMCA-ULA1 crank.
Product Specifications
| Specifications | Details |
|---|---|
| Model | Strummer DMCA-ULA1 |
| Type | Crank Arm Direct Mount |
| Material | Aluminium Alloy |
| Process | CNC Machined |
| Finish | Anodized Aluminium |
| Chainring System | Shimano Compatible Direct Mount |
| Crank System | Modular |
| Length Options | 165 mm, 167.5 mm, 170 mm |
| Spindle Compatibility | Ø29 mm |
| Crank Only Weight | ±415 grams |
| Chainring Compatibility | Single / Double Chainring |
| Adapter Compatibility | BCD 104 via ADTCR-104-SHM adapter (Sold Separately) |
Installation Notes
Ensure that the crank, spindle, bottom bracket, spacer, and chainring combination is compatible with the standards of the frame being used. Apply grease to the appropriate contact areas and avoid over-torquing during installation.
For best results, installation should be performed by an experienced mechanic,
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