Fat Bike, Workshop

Roamer update #5 Build and geometry

I get a lot of questions about the geometry on the Roamer so here is the build and numbers.


My idea about this frame was to get a bit more fun and aggressive fat bike. It´s basically an all mountain hardtail with 4.6″ tires. Ready to fit a 120 mm suspension fork up front for summer and rigid steel fork with anyting-cage mounts for winter bikepacking.

BTR makes the best hardtails in the world so they were the obvious choice for this bike.

I gave Tam my requests and he did the design with a little input from me regarding the fat bike specifics.

Since i ride it like a mountain bike in the summer i went for 100 mm bottombracket and 177 mm rear spacing. It fit 4.6″ tires (maybe 4.8″) on 80 mm rims. I´ve been running Dunder/Flowbeist from 45nrth and never felt i needed wider. And i ride snow for 7 months a year and plenty of beaches in the summer. Also 177 rear and 100 bb make it more like a regular mountainbike.


Reach (A): 450mm

Stack (B): 671.7mm

Seat Tube Length (C): 420mm

Effective Top Tube (D): 639.7mm

Bottom Bracket Drop (E): 70.3mm

Effective Chain Stay Length (F): 435mm

Wheelbase (G): 1195.7mm

Head Angle (H): 67deg

Effective Seat Angle (I): 74.2deg

Actual Seat Angle (J): 73deg

Head Tube Length (K): 130mm

Headset Lower Cup Stack (L): 14mm

Fork Axle-Crown (M) (Bluto): 531mm

Fork Offset (N): 51mm

The frame is hand built with Reynols 631 tubing the frame and 853 in the fork.

All housing is internal including dropper post.

Build kit:

Breaks – Shimano XT  with 203 mm front and rear discs

Drivetrain – 1×11 speed Shimano XT 11/40 but swapping to 11/42 or /46

Crankset  – Raceface Aeffect with 28t chainring

Pedals – Shimano Saint

Bottombracket – Hope

Head set – Hope

Stem – Thomson X4, 40 mm

Bars – Custom Oddmoné Titanium from Oddity Cycles 800 mm, 25 mm rise 15 degeers backsweep

Seatpost – Crankbrothers Highline dropper. Diameter 31.6, internal hosing. 

Grips – Lizardskin

Wheels – DT Swiss BR710 on Hope Fatsno Hubs. 177 mm  rear and 150 mm front

Tires, Summer – 4.4″ Jumbo Jims

Tires, Winter – 4.6″ 45nrth Dunder/Flowbeist













5 thoughts on “Roamer update #5 Build and geometry”

  1. Holy f*** that is a nice fatty!
    Just built up a BTR myself, and seeing your fat bike, I might have to get another…

    How far north in Sweden are you?

    1. Hi, thanks. I’m in Luleå. Thats pretty far up north. 66 parallel. 18 kilometers south of the Arctic Circle.

      1. I used to go down to Luleå every summer when I was a kid, I live up in Alta, so 70 degrees north, and I got bitten by the fat bike bug last winter. Love your blog man, nice write ups and some really good pictures.

  2. Holy f*** that is a nice fatty!
    Just built up a BTR myself, and seeing your fat bike, I might have to get another…

    How far north in Sweden are you?

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