L-TWOO eR7: wireless electronic shifting at a great price
Contents
In short
- The L-TWOO eR7 is a 2x12 wireless electronic road groupset.
- Complete package: shift/brake levers, derailleurs, hydraulic brake calipers, battery, charger.
- It's built on the same system as the top-of-the-range eRX, but with aluminium brake levers.
- Setup and updates via the free L-TWOO APP.
- Price: 161 900 Ft – the most affordable way into electronic shifting.
What is the L-TWOO eR7?
The L-TWOO eR7 is made for riders who want to move from mechanical to electronic shifting without paying what the big brands charge for their electronic groupsets. Press a button and the shift happens quickly and precisely, even in rain and cold. The rear derailleur talks wirelessly to the shift/brake levers, and both derailleurs are powered by a single battery hidden in the seatpost.
L-TWOO's founder, Liu Chunsheng, spent ten years at SRAM before starting his own company in Zhuhai, southern China. The brand launched its first wireless road system in 2023, and the eR7 is the more affordable version of that system.
What's in the box?
| Component | Model and details |
|---|---|
| Shift/brake levers | ST-ER1002-L / -R, wireless, with aluminium brake lever |
| Front derailleur | FD-ER1004; max. 54T chainring, 16T capacity, chainline 43.5–44.5 mm |
| Rear derailleur | RD-ER1003; largest sprocket 28–32T, smallest 11T |
| Brakes | Hydraulic, 160 mm flat mount front and rear calipers, finned brake pads |
| Battery | BT-ER02, seatpost-mounted |
| Charging | USB Type-C |
| App | L-TWOO APP (iOS, Android): pairing, fine-tuning, firmware updates |
| Not included | Crankset, chain, cassette, brake rotors |
| Price | 161 900 Ft |
Compatibility: what can you keep?
According to the brand, the electronic road groupsets also work with 10, 11 and 12-speed cassettes, so you may well be able to keep your current cassette, crankset and wheels. Keep the derailleurs' limits in mind: at the front, a big chainring of up to 54 teeth and a 16-tooth difference; at the rear, a largest sprocket of 28–32 teeth is the specified range.
Check your frame too: you'll need disc brakes with flat mount caliper mounts, a frame that can route hydraulic hoses, a seatpost that can take the battery, and Center Lock or six-bolt brake rotors for your wheels. If you're not sure, send us a photo of your frame and we'll help.
What does the press say about the system?
road.cc tested the sister model eRX, which is built on the same wireless system. On the plus side they highlighted the low weight, USB-C charging and compatibility with 10–12-speed cassettes, and found it worked well once set up. It was criticised for the lengthy setup, bleeding the brakes and the firmer hoods; the tester didn't find the shifting as refined as Shimano's or SRAM's systems. Overall, they gave it a cautious recommendation. BikeRadar's buyer's guide covers the background of the brand and its groupsets in detail.
eR7 or eRX?
- eR7 (161 900 Ft): aluminium brake levers, black finish, the lowest price.
- eRX (272 900 Ft): carbon brake levers, next-generation derailleurs in a bluish grey, the racers' choice.
Shifting and the app work the same on both. If price is your main concern, the eR7 gives you the same wireless experience. For time trials, take a look at the eR9-TT groupset; for gravel, the eGR 1x12.
Who is it for?
- Riders who want to switch from a mechanical groupset to electronic on a budget.
- Frame builds, if you're looking for a complete groupset that comes with brakes.
- Riders who like to set up and customise their bike themselves from their phone.
Pros and cons
Pros
- Wireless electronic shifting at the price of mechanical groupsets
- Complete groupset with hydraulic disc brakes
- Works with 10–12-speed cassettes too
Cons
- Installation and bleeding the brakes take patience or a workshop
- According to tests, shifting refinement still lags behind Shimano and SRAM
Why buy from Premiumbike?
You're buying from a Hungarian webshop, so there's no hassle with ordering from abroad, customs or long-distance support, and we're happy to help with compatibility questions. Groupsets in stock ship within 2–4 working days, free over 75 000 Ft, and you have a 14-day right of withdrawal.
Check out our L-TWOO brand page and all electronic road groupsets, or order the L-TWOO eR7 groupset now.
