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













Posted by

Bike geek in Swedish Lapland. Winter, summer, i always ride.

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. 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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