Rohloff fat bike with Gates Carbon Belt Drive

Frames from £1,150, Full bikes from £3,875

Fat bikes are so much fun and as so many people have asked for one, we’ve decided make one. 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.

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 us to run a massive 4.8" tyre on the rear. 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 somethign smaller than the massive 4.8" tyres our Roloff bike is fitted with. You can stick with the 4.8" on the font though.

Adding to the versatility of this bike is the compatibility with 29+ wheel options. Rather conveniently, the outer diamter of a 4.8" fatbike tyre is almost exactly the same as the outer diamter 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.

Note that images displayed on this page may vary from the final build chosen.


Medium Large
A - Head angle 69º 69º
B - Seat angle 72.5º 72.5º
C - Top tube * 594mm 619mm
D - Seat tube ** 485mm 500mm
E - BB drop 60mm 60mm
F - Chainstay length 448mm 448mm
G - Headtube length 110mm 120mm
H - Wheelbase 1104mm 1129mm
I - Front-centre 662mm 687mm
J - Fork offset 45mm 45mm
K - Trail *** 99mm 99mm
L - Reach 400mm 422mm
M - Stack 610mm 620mm

* Effective. ** Centre to top. *** Based on 4.8" tyres.


Unless otherwise agreed, all complete bikes will be setup with 10mm of spacers under the stem. Stem lengths and seatpost types (layback or inline) are frame size specific to enable maximum amount of adjustability. We can provide a dimensioned drawing of final setup on request.

Finding the right size

If you have questions about the frame size and position that suits you best, we can help. Just get in touch to discuss the fitting process and we’ll talk you through our online fitting form. If you already have fit information from a 3rd party, we can make use this too.

Womens sizes

As all Shand bikes are built to order, we aim to ensure our bikes fit all customers perfectly – regardless of gender. Read more about how we ensure a perfect bike fit for women.

Custom frame sizes

For specific fit requirements beyond our production frame sizes, we provide a custom fit service to make a bike that fits you perfectly.



All our bikes are painted to order from a standard range of 30 colours. Metallic and custom colours are also available for an additional charge – as are custom colours and one-off graphics if you’re looking for something more individual.

For more information on our paint process, visit the Paint and graphics page.


We are specialists in the design and build of Rohloff compatible frames. Rohloff are renowned the world over as the leading manufacturer of internal geared hubs. Being fully sealed from the dirt, the Rohloff Speedhub is an exceptionally reliable unit making it ideal for touring, daily commuting or everyday riding where reliability and the promise of extremely low maintenance are key.

The Rohloff Speedhub does away with the need for a front derailleur and has fourteen gears that cover the range of a typical derailleur gear setup. Designed around the Rohloff Speedhub the Tumshie has an Eccentric PF30 Bottom Bracket to provide an elegant solution for easy belt/chain tensioning.

To read more on our Rohloff expertise click here.


We are an approved supplier of Gates Carbon Belt Drive systems, so can provide a belt drive with your Rohloff build for improved maintenance and a clean, lubricant-free drivetrain. Our frames have been stiffness tested for torsional rigidity ensuring accurate alignment of the belt under heavy pedalling or touring loads.

All of our beltdrive bikes are fitted with the newest CDX (CentreTrack) belt systems with the rear sprocket fitted in the factory by Rohloff.

To maintain the integrity and strength of the belt system, the belt itself cannot be broken in order to fit into the bike. To manage this, all of our Stoater, Tumshie and Bahookie frames come with a ‘splitter’ integrated within the rear dropout to allow belt drive fitting and removal. This future proofs your frame if you think you may want to fit a beltdrive later.


All our steel bikes are fabricated and built to order in our workshop in Central Scotland. Use the options below to work out your ideal build spec. We ship directly to customers worldwide. For more information on international orders, see this page. Our current leadtime (from deposit paid to ready-to-deliver) is currently around 16-20 weeks.


To place an order with us, configure the bike using the options below, fill out your name and email address and submit the form. This will take you to a page summarising the order and providing you with a link to pay the deposit.

Complete bike or frame only?

Size and colours


If you are unsure about what size you need, just select the 'to be confirmed' option above and we'll get in touch to help.

Upgrades and accessories


This selection is for complete bikes only. Complete bikes includes carbon fork as standard. For frame and fork only options, see the top dropdown (full bike or frame only).

Delivery options

We ship bikes and frames worldwide.
For more information on international orders, see this page.

Total Cost


Frame Custom blend of high performance tubing from Reynolds, Columbus and Dedacciai. 31.6 dropper post compatible (stealth routing).
Fork Shand FAT-ONE Carbon fork, 150mm thru-axle.
Headtube/headset 44mm tapered compatible. Chris King headset installed on complete bike.
Bottom bracket 100mm PF30 shell
Seattube 30.9mm/27.2 seatpost with supplied shim, dropper post compatible with internal stealth routing.
Rear dropouts Polydrop modular dropout with support for 170mm Rohloff, 177x12 thru axle or 170x10 QR. IGH, derailleur or singlespeed ready
Cable routing Bolt on cable guides for clean routing and ultimate versatility
Fittings 3 sets of bottle mounts, rack mounts, dropper routing as standard.


Tyres Surly Knard 26 x 4.8"
Wheels Rohloff/Sun Mulefat rear, Hope Fatsno/Sun Mulefat front
Headset Cane Creek
Stem Shand
Bars Thomson Trail
Shifters Rohloff
Brakes Shimano M8000 XT hydraulic
Front Mech n/a
Rear Mech n/a
Chain Gates Carbondrive Belt
Crank Surly/Carbondrive 38T
Bottom Bracket Problem Solvers EBB
Cassette Gates Carbondrive 20T
Seatpost Shand


Rockshox Reverb Dropper Post


Rockshox Bluto RL 100mm suspension fork