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Genesis Datum 20 Road Bike 2016

Product Code: 145575

The Datum marks a turning point in road riding; the end of our unhealthy love affair with the 23c tyre.

And, herein lies the key to the new Datum – its’ 33c rubber boots. Turns out they’re not as slow and energy sapping as folks first thought and, we could even get used to what feels like riding on fast, 80psi pillows of air.

People are coming round to the fact that maybe, just maybe what the pro’s are using perhaps isn’t quite the right choice for them. It’s this ethos we’ve tried to emulate with the new Datum - distinctly traditional elements (in the return to the larger volume tyres of yesteryear) bought bang-up-to-date with the pairing of of disc brakes and a modern carbon frame.


BB86 Press-Fit BB

BB86 Press-Fit Bottom Bracket provides the basis for a stiffer, more efficient pedalling platform and wider spaced bearings which helps spreads the load increasing longevity to help you keep spinning smoothly mile after mile.

Shimano RS505 Hydraulics

Shimano continue to pave the way in regards to hydraulic braking in dropbar format. Their new ST-RS505 shifter units pick up where the ST-RS685 left off, combining conventional mechanical 11sp shifting and dedicated hydraulic braking in a more affordable, accessible package. They offer consistent, powerful braking and exceptional lever modulation all backed-up by Shimano's legendary reliability. A real game changer.

Challenge Strada Bianca

Brand new, larger 700x33c Challenge Strada Bianca clinchers use the same proven tread as found on their Paris-Roubaix model on a larger volume 33c casing. Competeively light @ 355g considering there's a PPS (puncture protection strip) underneath the tread too!

Fender friendly

Naturally there are mudguard eyelets – x2 on the inside of either fork leg just above the caliper which are still low enough to provide a stiff, supportive mount but unobtrusive if not in use, and threaded eyelets on the back of fork crown, backside of the bb shell and underside of the seatstay bridge (it’s only there to provide a mounting point for a mudguard). 32/33mm tyres and 45mm full-length guards should fit fine.

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Product Specifications

Frame and Fork

Frame: 24/30T Monocoque Carbon Road Disc w/ Tapered Headtube & Fully Internal Cable Routing

Fork: Full Carbon Fork w/ 1-1/2" - 1-1/8" Tapered Steerer &

Headset: FSA Orbit C-40 / No.42 Integrated

Colour: Raw Carbon Gloss Black

Weight: 9.04kg (Med w/o pedals)

Sizes: XS/S/M/L/XL


Shifters: Shimano ST-RS505

Rear Derailleur: Shimano 105 RD-5800-GS

Front Derailleur: Shimano 105 FD-5800

Chainset: Shimano 105 FC-5800, 50/34T

Bottom Bracket: Shimano BB-RS500, Press-fit 86.5mm

Chain: KMC X11

Freewheel: Shimano CS-HG5800, 11-32T

Wheels and Braking




Tyres: Challenge Strada Bianca CL Plus, 700x33c

Brakes: Shimano BR-RS505 w/ SM-RT86 160mm Icetech Rotors

Brake Levers: w/ Shifters

Contact Zones

Handlebars: Genesis RandoX Flared (D125/R70mm)

Stem: Genesis Road (+/-7

Grips: Genesis Microfiber Anti-Slip w/ VexGel

Saddle: Genesis Road Race

Seatpost: Genesis,

Seat Clamp

Pedals: N/A


Datum 20 Geometry

1 - Horizontal Toptube Length (mm) 526 542 561 579 595
2 - Seat Angle (°) 73.5 73.5 73.25 73 73
3 - Headtube Length (mm) 115 135 155 175 195
4 - Head Angle (°) 72 72 72 72 72
5 - Seat Tube Length (C-T, mm) 460 490 520 540 570
6 - BB Drop (mm) 72 72 72 72 72
7 - Chanstay Length (mm) 420 420 420 420 420
8 - Fork Offset (mm) 50 50 50 50 50
9 - Trail (mm) 59 59 59 59 59
10 - Wheelbase Length (mm) 985 1001 1017 1033 1050
12 - Stack (mm) 544 563 585 602 621
13 - Reach (mm) 365 375 385 395 405
Stem (mm) 100 100 100 110 110
Handlebar (mm) 400 420 420 440 440
Crankarm (mm) 170 172.5 172.5 175 175
0% Finance subject to status, written quotations on request.
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* Prices are estimates and will be calculated at checkout based on your minimum deposit.
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