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2018 Genesis

Tarn 20

A 27.5″ steel frame hardtail trail bike with upper mid-range components.

Manufacturer Price

£2,199($2,949)
FrameSteel
SuspensionHardtail, 120mm
ForkRockShox Pike RC
Wheels27.5″ Aluminum
Drivetrain1 × 11
GroupsetSLX
BrakesShimano Deore Hydraulic Disc
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Tarn 20
Other Trail bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

24 mph

Tarn 20

26 mph

Similar Bikes

Highest gear

(descending)

Sizing
SM

5'2" – 5'8"

MD

5'6" – 5'11"

LG

5'10" – 6'3"

XL

6'1" – 6'7"

🐐 Estimated

Rider Fit Notes

None yet.

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Reviews

Summary

The Genesis Tarn is celebrated as a highly competent and entertaining trail hardtail, offering a surprisingly comfortable ride with its plus-size tyres and seamless double butted cromoly steel frame. It excels in mixed trail riding, balancing a lively feel for technical sections with stability on descents. While it's praised for its modern geometry and the inclusion of a dropper post, some reviewers note the tyres may not suit all UK conditions and the bike's weight could be a drawback.

Pros
  • Highly competent and entertaining ride

  • Surprisingly comfortable with plus-size tyres

  • Modern geometry and stable on descents

  • Seamless double butted cromoly steel frame

  • Inclusion of a dropper post

Cons
  • Tyres may not suit all UK conditions

  • Relatively heavy

  • Some components could be improved for technical riding

Key Quotes
The Genesis Tarn is a refreshingly different take on the UK trail hardtail
off.road.cc logooff.road.cc
It’s a highly competent and entertaining ride
off.road.cc logooff.road.cc
The Tarn 20 is a well-rounded trail hardtail
MBR logoMBR
‘Haters gonna hate’ but this plus-bike is one of the best steel hardtails out there
BikeRadar logoBikeRadar

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View all reviews

off.road.cc
Genesis Tarn 20

Jul 2017

The Genesis Tarn is a refreshingly different take on the UK trail hardtail, with a combination of chubby 2.8” Plus rubber, a zingy steel frame and more stretched out geometry for 2017. If you’re willing to take a punt on something a little out of the ordinary, it’s a highly competent and entertaining ride, but do budget for some more aggressive tyres for soft conditions. What frame material is best? Check out our guide Looking for your first mountain bike? Here's everything you need to know At the heart of the Tarn is a frame made from seamless double butted cromoly steel.

Read Review

MBR
Genesis Tarn 20 (2017) first ride - MBR

Jan 2017 · Mountain Bike Rider

Expanding its range, sorting its sizing and making the best of Plus-size tyres — Genesis Tarn 20 is another trail-ripping hardtail from Genesis.

Highs
  • It has everything you need from a true trail ripper. Plus-size tyres deliver a surprisingly comfortable ride.

Lows
  • It’s not lightweight by any means, but going tubeless should drop the weight by almost 500g. With the refocused sizing, the 60mm stem seems too long for what this bike is capable of.

Read Review

BikeRadar
Genesis Tarn 20 2017 first ride review

Oct 2016 · Matt Legg-Bagg

Last year the Genesis Tarn made quite an impression with its ‘from the future’ long front-end geometry and bulbous plus-sized tyres.

Read Review

Geometry
Specs
Build
Frame

Genesis MjÖlnir Seamless Double-Butted Cromoly

BB StandardBSA, Threaded

Fork

Rockshox Pike RC, Solo Air, 120mm, Tapered Steerer, 110mm x 15mm

Travel120mm

Spring TypeAir

Bottom Bracket

Shimano BB-52

Headset

PRESTINE PT-F17A, ID:34/ID:45

Stem

Genesis 60mm /+0deg

Handlebar

Genesis alloy / 760mm x 5mm rise

Saddle

Genesis MTB

Pedals

Genesis

Groupset
Rear Derailleur

Shimano SLX RD-M7000-11

Crank

Shimano SLX FC-M7000-B 32T

Shifters

Shimano SLX SL-M7000 - R

Cassette

Shimano SLX CS-M7000 / 11-46T

Chain

KMC x11

Brakes

Shimano MT500 180/160mm

TypeShimano Deore Hydraulic Disc

Brake Levers

Shimano MT500

Wheels
Rims

WTB Scraper i40 / 32h

Spokes

Stainless steel 14g

Front Hub

Shimano HB-M618 / FH-M618 32h

Rear Hub

Shimano HB-M618 / FH-M618 32h

Tires

Maxxis Rekon 27.5x2.80" Dual Compound/EXO/TR, 60TPI

Rider Notes
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First added October 5

Last updated October 5

Not listed for 2,793 days