Bike parts aimed at keeping gears shifting cleanly for commuters and leisure riders. Dependable indexed changes and light-action shifting come together in SHIMANO Bike Rear Derailleur RD-TY300. Is it the right replacement for a worn rear derailleur?
⚡ At a Glance
- • Shifting Performance: SIS rear index shifting for consistent 6/7-speed gear selection
- • Best for: Commuters and recreational riders needing a straightforward replacement derailleur
- • Not ideal for: Competitive riders seeking premium lightweight race components
Rear derailleur built for 6/7-speed drivetrains, with a mounting bracket and under-wheel-nut fit. Max sprocket capacity 34T and minimum 11T for common cassette ranges.
Precise Indexed Shifts - with SIS rear index shifting
SIS rear index shifting aligns each shifter click with a defined derailleur position, configured for 6/7-speed setups. The mechanism is matched to sprocket sizes between 11T and 34T for predictable travel per gear.
Consistent, accurate changes reduce time spent fine-tuning gears, making daily rides and occasional hill climbs feel smoother.
Simple Fit and Replacement - with under-wheel nut bracket mount
Bracket fit under the wheel nut enables attachment without a dedicated hanger, and a mounting bracket is included to ease installation. The mounting style suits frames that accept wheel-nut bracket fittings.
Quick to install for many common frames, useful when replacing a worn derailleur at home or in a local workshop.
Light Shifting Effort - thanks to advanced light action design
Advanced light action design lowers the required lever force for gear changes by refining the internal spring and pivot behaviour. The mechanism smooths cable pull and reduces harsh catches during shifts.
Softer lever feel makes gear changes easier, beneficial for riders who prefer low-effort shifting or who carry children or luggage.
✨ The 4 Key Reasons for SHIMANO Bike Rear Derailleur RD-TY300
- SIS Indexing – Accurate gear selection with clear shifter clicks under load
- 6/7-Speed Compatibility – Fits common entry to mid-level drivetrains easily without modification
- 34T Max Sprocket – Handles larger cassette cogs for easier hill climbing
- Mounting Bracket Included – Simplifies installation on wheel-nut frames, useful for home mechanics
📋 Technical Details at a Glance
- Type: Rear derailleur
- Brand: SHIMANO
- Model: RD-TY300
- Compatibility: 6/7-speed drivetrains
- Shifting system: SIS rear index shifting
❓ Frequently Asked Questions
Q: What speeds does the derailleur support?
A: Compatible with 6-speed and 7-speed drivetrains according to the product description.
Q: What sprocket sizes can it handle?
A: Maximum sprocket size is 34T and minimum sprocket size is 11T.
Q: How does it mount to a bike?
A: Bracket fit under the wheel nut, and a mounting bracket is included for installation.
🏆 Our Verdict
Suitable for commuters and recreational riders seeking a reliable, easy-to-fit rear derailleur. The combination of SIS indexing, advanced light action design, and an under-wheel-nut mounting bracket makes gear changes smoother and installation simpler. Presents a practical long-term replacement to restore dependable shifting on everyday bikes.
