Bike Build · Field Manual

Building the Wizard + Alfine

Skim-sized guides for each job, written to read while you do other things — so the build feels familiar before a single spanner is turned, and so you know what to buy.

The bike, in one breath Magic Components “The Wizard” — chromoly 26" ATB, rigid steel fork, 132.5 mm QR rear (cold-set to 135), 68 mm BSA BB, 27.2 mm post, 1‑1/8" head tube, V‑brake / rim. Geared by a Shimano Alfine internal hub → one straight, fat chain, no derailleur, tensioned by the bolt‑on horizontal single‑speed dropout. Electronics‑free.

The jobs

Roughly ordered easiest → hardest. The real difficulty isn’t the spanner work — it’s buying parts that match. These guides do that matching for you.

01 · Easy

Bottom bracket

The pedal bearings. Screw two greased cups in — but the drive side is reverse‑threaded.

02 · Easy (cut) / shop (press)

Headset & steerer

Un‑scaring the “press” thing: cutting = a saw, pressing = a one‑time shop job.

03 · Medium / fiddly

Chainline & chain tension

Getting the single chain dead‑straight and drum‑tight on the horizontal dropout.

04 · Medium

Alfine hub & shifter

Cable, cassette joint, and lining up the yellow marks so the gears actually shift.

05 · Medium / safety‑critical

V‑brakes

Death by a thousand small adjustments — and it’s your stopping power, so get it right.

06 · Medium / one‑time / nervy

Cold‑setting the frame

Gently spreading the steel rear end 132.5 → 135 mm to fit the Alfine, kept aligned.

07 · Hard / the craft

Wheel building

Hub + rim + spokes + nipples, laced and tensioned true. The real mountain — and the most satisfying skill to own.

The smart split Hand the one‑time press/cut jobs — headset cups pressed, steerer cut, BB faced — to a shop in a single ~$50–80 visit (they own the presses you’d use once). Then take the frame home and do the wheel + the whole assembly yourself. To be self‑sufficient you need a spoke wrench, not a headset press.
Your tool kit to buy Spoke wrench (~$15) · truing stand (~$70–150) · spoke tension meter (Park TM‑1, ~$80) · BB tool (~$20) · torque wrench (~$50–80). The exotic presses stay at the shop.

Guides reflect the build as of June 2026 — verify torque specs and exact part numbers against the actual components when they arrive.