SILEX 4000


Carbon gravel bike with Shimano's highly acclaimed gravel specific GRX400 2 x 10 groupset and hydraulic disc brakes.
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The Silex was a ground up design project. Rather than taking a road or cyclocross bike and re-jigging the recipe, the starting point for the Silex was modern MTB inspired geometry; long top and head tubes and a short stem, offering nimble, confidence-inspiring handling.

At launch, it was hailed as the most comfortable and versatile bike we had ever made. The cycling press loved it too: “exceptional ride quality” (Cycling Plus), “a highly versatile bike” (IMB), “the best bike of this genre” (Offroad CC).

There's a certain beauty in just riding without watching the time, heading wherever you feel the urge. For those rides, the test and award-winning Silex makes total sense.

The bike has five sets of bottle bosses and rack mounting points offering multiple luggage carrying options.

All Silex models are equipped with powerful hydraulic disc brakes. Calipers are mounted on the chainstay for better dissipation of braking forces using the flat-mount standard for a neat, flush fit. Calipers sit on top of CNCd aluminium Disc Cooler fins, reducing operating temperatures by up to 35%; particularly important when running fully loaded.

  • MTB Inspired gravel geometry
  • Lightweight carbon frame
  • Carbon fork with tapered steerer
  • Shimano GRX400 groupset
  • Hydraulic disc brakes
  • 12mm bolt through axles
  • material: carbon
  • 700x38C / 650Bx45C max. wheelsize
  • 100x12/142x12mm axle standard
  • BB386 bottom bracket standard
  • MUK 36/ MUK 41 (Shimano direct mount) Hanger
frame size S, M, L, XL
  • Tapered
  • material: carbon
  • 700x38C / 650Bx45C max. wheelsize
  • 17mm inner width
  • 22mm height
  • material: aluminium
  • 100x12mm width front hub
  • 32 spoke holes
  • centerlock
  • 142x12mm width rear hub
  • 32 spoke holes
  • centerlock
  • 700x38C
  • fold
  • TR
  • EXO
  • 700x38C
  • fold
  • TR
  • EXO
  • including removeable lever, 6/4mm allen key
  • 46-30 teeth
  • 170 mm-XS/S, 172,5 mm-M, 175 mm-L/XL
crank 170 mm-XS/S, 172,5 mm-M, 175 mm-L/XL
bottom bracket FSA 386-BB30 PF6000 [Sram FC]
  • 11-36 teeth
  • 10 speed
chain KMC X10
shifters Shimano GRX400
front derailleur Shimano GRX400
rear derailleur Shimano GRX400
brake lever Shimano GRX400
headset SILEX Neck
  • material: aluminium
  • 31.8mm diameter
  • -8° stem angle
  • 80 mm all sizes
stem size 80 mm all sizes
  • material: aluminium
  • 400mm (XS-S), 420mm (M), 440mm (L/XL)
  • material: carbon
  • 30.9mm diameter
  • 0mm setback
seat clamp MERIDA SILEX
Bike Frame Geometry Image
Frame Size S M L XL
Tyre Sizes 28" 28" 28" 28"
St Seat Tubes mm 470 500 530 560
Tt Top Tubes mm 564 580 600 620
Cs Chain Stays mm 430 430 430 430
HTA head tube angle [°] 71 71 71 71
STA seat tube angle [°] 74 74 74 74
Bd Bottom Bracket Drops mm 75 75 75 75
Ht Head Tube Lengths mm 180 200 220 240
Fl Fork Lengths mm 398 398 398 398
R Reach mm 390 400 415 430
S Stacks mm 607 626 645 664
Wb Wheel Base mm 1044 1061 1082 1104
Sh Stand Over Height mm 736 765 794 822
No. Item-No. Name Info Pieces Torque NM
1 A2258000143 CABLE GUIDE for Di2 1
2 A2258000189 CABLE GUIDE for mechanical 1
3 A2300000550 SCREW M3x0.5 L12mm 1 2~3
4 A2247000095 CLAMP for seatpost 1 4~5
5 A2136000116 MOUNT for FD 1
6 A2322000048 COVER for FD-Mount 1
7 A2300000056 SCREW M5x0.8 L12mm 2 4~5
8 A2143000149 CABLE PLUG for FD 1
9 A2322000046 PROTECTOR for CS 1
10 A2258000053 CABLE PLUG for Di2 1
11 A2258000056 CABLE PLUG for mechanical 1
12 A2164000027 DISC COOLER rear; for FM160 only 1
13 A2302000018 NUT for rear axle M12x1,5 1
14 A2300000310 SCREW M3x0.5 L18mm 1 3~4
15 A2300000314 SCREW M3x0.5 L15mm 1 3~4
16.1 A2311000095 RD-HANGER DH - 065 for SHIMANO direct mount 1
16.2 A2311000062 RD-HANGER DH - 054 for ROAD-RD 1
17 A2143000017 BLIND PLUG 1
18 A2300000485 SCREW M4x0.7 L6mm 2 3~4
19 A2298000061 SCREW M5x0.8 L15mm 4 3~4
20 A2143000161 BLIND PLUG 6
21 A2258000098 CABLE GUIDE for Di2 1

To reduce production and delivery times, we are sometimes forced to make last-minute specification changes. Please be aware that those changes might not be reflected on these product pages and images.




Steering precision is vital to safe and confident handling, and the X-TAPER HEADTUBE allows us to significantly boost this precision. A larger headset diameter at the bottom paired with a smaller one at the top helps to deal with the strains modern riding and equipment can put on the headtube, all without adding unnecessary weight. It allows tapered forks to be fitted with ease and delivers precise and confidence-inspiring steering.



On the majority of our frames, we run the gear and brake cables and hoses through the frame. The cables enter and exit the frame through smooth sockets, or we use one of our other systems like SMART ENTRY or WIRE PORT to be routed through. Running the cables inside the frame protects them from the elements, gives a clean and neat look and can offer aerodynamic advantages.



Shimano's Di2 electronic shifting system offers fast, smooth and reliable shifting. In particular, in the road world, it has proven itself as the primary choice when top performance is at the top of the agenda. With that in mind, we have a broad selection of performance road frames that are Di2 READY and can accommodate the electrical cable, battery and other little tweaks that the system requires.



NANO MATRIX CARBON is a special kind of carbon fibre where we add extremely tiny, nano-scale particles to the resin that binds the individual carbon fibres together. These then work on a molecular level to protect them from damage. It’s so effective that it can actually increase the finished carbon fibre’s impact resistance by up to 40%, allowing us to build stronger and lighter composite frames that result in a faster and tougher bike.



This is a method we use to manufacture our carbon fibre frames. First, the carbon fibre that makes up the frame is laid around special formers. We then use a bladder to compress the layers against the outside of the frame mould, giving a smooth and wrinkle-free internal finish, removing any voids in between the layers of carbon that can cause potential weak points, resulting in a stronger, lighter frame.



Being able to turn your bike into an all-weather commuter that has mudguards and other fittings can be a real plus, in particular when riding on wet and perhaps muddy roads and tracks on a regular basis. To make fitting easy, some of our bikes are F-MOUNT equipped. These integrated fittings mounts make adding mudguards fast and simple. Please note that some bikes require model-specific mudguards.



Similar to our F-MOUNT, where various fixing points for mudguards are part of the frame offering, the C-MOUNT equipped bikes have the fixing points for a rear rack already integrated, making fitting fast, simple and reliable. The C-MOUNTS are an additional feature that improves the day-to-day versatility by adding loading capacity to your bike, ideal for commuting and shopping trips. Please note that some bikes require model-specific rear racks.



Used on our carbon fibre road and gravel bikes, DISC COOLER is a finned piece of forged aluminium that sits between the brake calliper and frame. The aluminium piece helps to draw heat from the braking system and radiates it away quickly. It reduces the temperatures by up to 35% and helps to keep your brakes working at their best for improved control and performance on long descents and under heavy braking.



When every second counts, the smallest of details can make the difference between winning and losing, so we look at every aspect of our frames to make them as sleek as possible. By using a seat post clamping mechanism that secures the post with a wedge inside the frame itself, we minimise the turbulence and potential drag while keeping post height adjustment simple, giving a frame that is more aerodynamic and also better looking.