![]() All of them use Shimano's Shadow RD+ technology which is designed to stabilise the chain on rough terrain by minimising unnecessary derailleur arm movement. Mechanical and electronic GRX rear derailleurs are available. You can have a GRX groupset with either a mechanical or electronic front derailleur.Ĭompared to regular road front derailleurs, the GRX front derailleurs have an additional 2.5mm outboard clearance to provide space for wider tyres, up to 42mm.įor this reason the front mech must be used with the matching GRX chainset (see above) which is similarly pushed outward from the frame by 2.5mm.īoth the RX810 mechanical front derailleur and the RX815 Di2 front derailleur (pictured above) have the capacity to accommodate a 17-tooth difference between chainring sizes (as found on a 48/31-tooth GRX chainset) while the RX400 10-speed front derailleur accommodates the 16-tooth difference between the RX600 chainset's 46/30-tooth chainrings.ĭave Arthur used the RX810-F front derailleur and said, "Front shifts well despite that 17-tooth jump between the two rings and being asked to do so in adverse conditions and with a regularity that rolling terrain requires."Ĭlaimed weight refers to band type, L size Model 1x claimed weights are with a 40-tooth chainring Model reviewer Mike Stead tested the GRX RX810 chainset (pictured above) with a 40-tooth chainring and said, "The combination of the clutch (see below) and alternating chainring tooth profile meant no matter what I tried, the chain stayed put and was almost totally silent." Claimed weights are with 170mm cranks. The single ring chainsets use Shimano’s Dynamic Chain Engagement tooth profile – tall teeth that are alternately thick and thin, specially shaped to prevent the chain bouncing off on rough terrain. ![]() ![]() The key difference between the GRX 800 chainsets and the GRX 600 chainsets is that GRX 800 uses Shimano's Hollowtech II hollow crank arm technology to reduce the weight. ![]() Instead, there's a RX600 10-speed chainset with 46/30-tooth chainrings. The GRX 600 series chainset is available 2x with 46/30-tooth chainrings, and 1x with a 40-tooth chainring. The GRX 800 series chainset is available 2x with 48/31-tooth chainrings, and 1x with either a 42-tooth or 40-tooth chainring. Each has a chainline that has been shifted outwards by 2.5mm compared with existing road components for increased tyre and frame clearance.Ĭheck out 19 Shimano GRX bikes you can buy now from Cannondale, Canyon, Bianchi, Scott, Mason, 3T, Genesis, Cube and more There are three types of chainset to choose from: 1x11-speed, 2x11-speed, and 2x10-speed (there is no dedicated 1x10-speed chainset). Let’s look at GRX in detail, broken down into each component type. Not surprising given GRX's intended use, you get hydraulic disc brakes across the board.Ĭassette and chain options come from current road (Ultegra, 105, Tiagra) and mountain bike (XT, SLX, Deore) groupsets. This is the way that Shimano structures everything on its website. You can then look at the options available within each category. Go to our complete guide to Shimano road bike groupsets for a rundown of Shimano's groupset hierarchyįor this reason, it's easiest to decide first whether you want: In other words, you sometimes have to mix and match. You can't have a complete RX600 groupset because there's no such thing as an RX600 rear derailleur, for instance if you want an 11-speed mechanical rear derailleur you need to go for RX800 level. That's all simple enough, but things are complicated by the fact that you can't get every component at every level. RX400 Shimano Tiagra level and 10-speed.RX600 Shimano 105 level and mainly 11-speed (although there is a 10-speed RX600 chainset too).You can get mechanical and electronic (Di2) setups. RX800 Shimano Ultegra level and 11-speed. ![]() GRX is divided into three different levels: ![]()
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