LTWOO RX Groupset Review: A Complete 12-Speed Package With Two Real Compromises

Introduction

The LTWOO RX is a 12-speed groupset sold for around £200, and it arrives as a complete package rather than a partial kit. Shifters, derailleurs, rotors, cable-actuated brake calipers, cassette and chain are all included, which removes the extra sourcing work that usually comes with a budget drivetrain upgrade.

This article covers a full installation on a race bike and several weeks of riding, including wet-weather braking. The short version: the shifting is genuinely good, the shifter bodies feel well above their price, and two specific compromises deserve attention before you buy.

On the scales, the shifters and derailleurs came to 744 g with cables still fitted, which accounts for a few grams of that figure. A comparable budget 12-speed groupset measured 708 g for the same parts, so weight is not where the difference between the two shows up.

Who This Groupset Is For

This groupset suits riders building up a frame on a tight budget, or upgrading an older bike to 12 speeds without paying branded groupset money. It also suits anyone who is comfortable installing their own components, routing cables and adjusting derailleurs, because a kit at this price assumes some workshop time.

It is a weaker match for riders who shift from the drops while riding hard, and for frames with long, tightly curved internal front brake routing. Both points are covered in more detail below.

The single-purchase angle is a real advantage. Buying rotors, a cassette, a chain and calipers separately adds up quickly, and having everything arrive together keeps a build moving.

Main Strengths

The strengths here are concentrated in the shifter bodies and in how the drivetrain behaves once it is set up properly.

Shifter Feel and Build Quality

The shifters feel premium, noticeably more so than the budget 12-speed groupset they replaced. The hoods feel like better quality material, they do not rattle, and the lever action is positive rather than vague. The finish also looks a step above what the price suggests.

The shifter shape is heavily inspired by Campagnolo levers. For riders used to that layout it will feel familiar; for everyone else it is simply a matter of preference. Either way, the bodies sit comfortably in the hand and the rubber hoods feel well made.

The end of the shifter has a pronounced bump, which makes it hard to slide forward off the front of the hood when you hit a pothole. It is a small detail, and a useful one.

The right-hand paddle can shift two gears with a single push. The budget groupset it replaced could only shift one gear at a time, so this is a genuine step up. The action is very light, which means riders who only want a single-gear change need a little care with the push.

Shifting Performance on the Road

The rear derailleur indexed perfectly straight out of its plastic wrapping. That is unusual for a budget groupset and saves a lot of setup time.

On the road the drivetrain shifts well and very smoothly, and the changes happen quickly. The front derailleur felt like it had quite a lot of resistance when the bike was in the stand, but that sensation did not carry over to riding. It has a few trim positions, and the front cable needed a small tension adjustment to line those positions up with where they are actually needed.

The brake calipers are cable actuated with a hydraulic reservoir inside, a design that is common among brake options in this price bracket. Braking is strong, and bite stays more consistent in the wet than with the cable-actuated calipers previously fitted to the same bike. The stock pads have a gold finish, and while it is generally advised to swap budget pads for Shimano-compatible ones, these performed well enough that the swap is not automatic.

Things to Consider Before Buying

Two issues stood out during testing, and both are worth weighing against your own frame and riding style.

Thumb Button Reach in the Drops

The downshift button on the shifter cannot be reached from the drops. That matters if you ride fast in the drops, where shifting to a harder gear is a routine need rather than an occasional one.

Campagnolo-style levers normally place this button within reach in the drops, and this groupset copies the general layout without matching that usability. Riders with unusually long thumbs might manage it, but typical hand proportions will not, even with large hands.

From the hoods the thumb buttons work well and feel natural, so the limitation is specific to the drops position.

Front Brake Cable Return With Internal Routing

The rear brake worked fine, but after a single brake application the front cable failed to return, leaving the front wheel dragging slightly. This is a routing problem rather than a caliper failure. The frame runs the brake cable internally through the handlebars, the head tube and the fork, and those twists and turns add friction.

The caliper previously fitted to the same bike coped with that routing, but this one needs more cable travel to operate, so it is more sensitive to drag in the system. Compressionless brake housing would likely improve the return, though rigid housing may not fit through these particular handlebars and forks.

The practical outcome is that these calipers did not work well on this internally routed bike, while the shifters themselves were worth keeping. Reverting to the earlier calipers is a workable combination.

Gear Cable Routing Options

The gear cable has a related quirk. There is only one port on the shifter, so the cable has to run on the inside of the handlebar. The groupset it replaced offered two options, and the outside route gives the cable a smoother curve, which matters for shifting performance on internally routed handlebars. The inside route is tighter, but cable length was sufficient here, so the tighter bend did not create a problem in practice.

Buying Advice

Buy the LTWOO RX if you want a complete 12-speed package at a low price, you are comfortable installing and adjusting it yourself, and your frame’s front brake routing is straightforward.

Think twice if you shift from the drops, or if your frame routes the front brake cable internally through the bars, stem and fork with tight curves. In that second case, plan extra setup time or keep the calipers that already worked on that bike.

Setup notes worth acting on: check front cable tension carefully so the front derailleur trim positions land where you need them, and consider compressionless brake housing if the front cable return feels slow. Pad choice is a judgement call, since the supplied pads performed well in testing.

Weight is worth a mention as well. The bike measured around 7 kg in its original build and 8.43 kg with this groupset fitted, so it is not the lightest route to 12 speeds.

Conclusion

The LTWOO RX delivers far more than its price suggests on the drivetrain side. Shifter feel, hood quality, rear indexing and shift speed are all strong, and the two-gear paddle is a feature that budget rivals often leave out.

The compromises are specific rather than general: no reachable downshift from the drops, and a front caliper that struggles with tight internal routing. Match the groupset to a frame and a riding style that avoid those two situations, and it makes a lot of sense.