Quick Summary
The Shimano Tourney FD-TY300 is a front derailleur for 3×6/7-speed setups with a 34.9 mm clamp band mount. It is an up-swing model, so the bike needs the same pull-up style before you choose it.
This derailleur is described with a 42T compatible tooth ratio and a 47.5-50 mm chain center line. Those are the key fit checks for matching the part to the bike’s front shifting setup.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Model | FD-TY300. Helps confirm the exact derailleur variant. |
| Product type | Front derailleur for front shifting on a bicycle. |
| Mount | Clamp band mount with 34.9 mm installation diameter. |
| Speed | 3×6/7-speed. Match this to the bike’s drivetrain setup. |
| Pull type | Up swing / pull-up type. Check the bike’s cable routing before buying. |
| Compatible tooth ratio | 42T. Compare this with the chainring setup on the bike. |
| Chain center line | 47.5-50 mm. Important for front derailleur alignment and fit. |
What to Compare Before Buying
- Pull type: This model is an up-swing, pull-up style derailleur. Compare that with the bike’s cable routing.
- Clamp size: The installation diameter is 34.9 mm. Check the seat tube size before choosing a replacement.
- Drivetrain speed: It is set up for 3×6/7-speed systems. Match the drivetrain configuration on the bike.
- Chainring size: The compatible tooth ratio is 42T. Confirm that it matches the front chainring setup.
- Chain center line: The stated range is 47.5-50 mm, which matters for alignment and shifting fit.
Compatibility, Size and Fit
This derailleur is made for bikes that use a 34.9 mm clamp band front derailleur mount and an up-swing, pull-up cable setup. It is also tied to a 3×6/7-speed drivetrain and a 42T compatible tooth ratio.
If the bike uses a pull-down front derailleur or a different clamp size, this version is not the right match. Check the existing derailleur style and the mounting diameter before ordering.
What Else You May Need
You may need the correct bicycle setup already in place for a 34.9 mm clamp band, an up-swing pull-up front derailleur, and a 3×6/7-speed drivetrain. Confirm those points before selecting an offer.
Before You Decide
Confirm the FD-TY300 model, the 34.9 mm clamp size, and the up-swing pull-up style before choosing an offer. Also check that your bike uses a 3×6/7-speed setup, a 42T compatible tooth ratio, and a 47.5-50 mm chain center line.
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