Adventure / Expedition / Mountain

Tumshie Rohloff

PRICE FROM: £4,250

Rohloff fat bike with Gates Belt Drive.

Fat bikes are fun so we decided to make one just for the hell of it. And here it is, the Tumshie!

Designed around 4.8″ tyres and Rohloff Speedhub with Gates Carbon Belt Drive, the bike is designed to be as maintenance free as possible when rolling through snow, sand or just good ol’ Scottish mud and rocky singletrack.

FRAME & FORK

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CONTROLS

01

Specification

The Paragon Polydrop rear dropouts (with integrated frame splitter for Belt Drive) and bolt on cable guides allow for fitting of other drivetrains, resulting in an extremely versatile fat bike frame to achieve the setup you want.

The Beltdrive Rohloff drivetrain allows a massive 4.8″ tyre on the rear and the frame has cable routing and optional derailleur hanger if you’d rather run a derailleur gear system instead.

[Note that when running a derailleur gear system, the chain will run closer to the tyre meaning you will probably have to fit something smaller than the massive 4.8″ tyres our Roloff bike is fitted with. You can stick with the 4.8″ on the front though.]

Adding to the versatility of this bike is the compatibility with 29+ wheel options. Rather conveniently, the outer diameter of a 4.8″ fatbike tyre is almost exactly the same as the outer diameter of a 29+ tyre. So if you’d like the option of using some of the newer 29+ wheel/tyre combinations then the Tumshie has you covered for that too.

The Tumshie comes with our own carbon fork but is also available with a Rockshox Bluto suspension fork.

Frame Tig welded Reynolds 853 heat-treated steel main tubes. 170mm QR rear spacing (For Rohloff).
Fork Carbon Fork 150mm Spacing
Headtube / Headset 44mm. Cane Creek 110 headset installed on complete bike.
Bottom Bracket Eccentric PF30
Seat Tube 30.9mm seatpost diameter, dropper post compatible with internal stealth routing.
Rear Dropouts Polydrop dropouts
Cable Routing Down tube, full outer bolt on guides.
Fitting 3 sets of bottle mounts, rack mounts, mudguard eyes as standard.
Weight Frame Weight 2060g (medium)
Tyres Schwalbe Jumbo Jim 26 x 4.8
Wheels SunRingle Mulefut Rims, Pro4 Front Hub, Rohloff 170mm QR
Headset Cane Creek 110
Stem Ritchey
Bars Ritchey
Shifters Rohloff
Brakes Shimano M8100
Front Mech N/A
Rear Mech N/A
Chain/Belt Carbondrive Gates CDX Belt
Crank Raceface
Bottom Bracket Eccentric PF30
Cassette/Sprocket Gates CDX
Seatpost Ritchey

02

Geometry

A - Head Angle69°
B - Seat Angle72.5°
C - Top Tube594mm
D - Seat Tube485mm
E - BB Drop60mm
F - Chainstay Length448mm
G - Headtube Length110mm
H - Wheelbase1104mm
I - Front-Centre662mm
J - Fork Offset45mm
K - Trail99mm
L - Reach400mm
M - Stack610mm
A - Head Angle69°
B - Seat Angle72.5°
C - Top Tube619mm
D - Seat Tube500mm
E - BB Drop60mm
F - Chainstay Length448mm
G - Headtube Length120mm
H - Wheelbase1129mm
I - Front-Centre687mm
J - Fork Offset45mm
K - Trail99mm
L - Reach422mm
M - Stack620mm