A rider in profile on a titanium gravel bike on a smart trainer in a pale grey studio, with white motion-capture markers on her ankle, knee, hip, shoulder, elbow and wrist.
Hip · angle88°
Locked
Knee · ext140°
Locked
Live248 W92 RPM
A rider in profile on a titanium gravel bike on a smart trainer in a pale grey studio, with white motion-capture markers on her ankle, knee, hip, shoulder, elbow and wrist.
Hip · angle88°
Locked
Knee · ext140°
Locked
Live248 W92 RPM
A rider in profile on a titanium gravel bike on a smart trainer in a pale grey studio, with white motion-capture markers on her ankle, knee, hip, shoulder, elbow and wrist.
Hip · angle88°
Locked
Knee · ext140°
Locked
Live248 W92 RPM

We measure you.
Then we build
the bike.

A three-dimensional bike fit, then a titanium frame drawn from your numbers and welded by hand under a railway arch in London.

Arch 31, London SE1

Studio open Tue–Sat

1,240 fits since 2017

186 frames welded in the arch

Est. 2017

Arch 31, London SE1

Studio open Tue–Sat

1,240 fits since 2017

Arch 31, London SE1

Studio open Tue–Sat

1,240 fits since 2017

186 frames welded in the arch

Two ways in

01 · The fit

Come for the fit.

2 h 30 · from £120

→

A cyclist's knee and ankle with glowing motion-capture markers, a fitter holding a goniometer beside the knee.

Ninety minutes on the trainer. Six markers. About four hundred numbers. Three of them matter.

Fit Check · £120

Full Fit · £280

01 · The fit

Come for the fit.

2 h 30 · from £120

A cyclist's knee and ankle with glowing motion-capture markers, a fitter holding a goniometer beside the knee.

Ninety minutes on the trainer. Six markers. About four hundred numbers. Three of them matter.

Fit Check · £120

Full Fit · £280

02 · The frame

Stay for a frame.

14 weeks · from £3,900

→

A framebuilder in a welding helmet TIG-welds a titanium top tube in a steel jig, lit by the blue arc.

A titanium frame drawn from your fit, welded by hand, numbered and yours. Fourteen weeks.

Frame · from £3,900

Complete bike · from £6,800

02 · The frame

Stay for a frame.

14 weeks · from £3,900

A framebuilder in a welding helmet TIG-welds a titanium top tube in a steel jig, lit by the blue arc.

A titanium frame drawn from your fit, welded by hand, numbered and yours. Fourteen weeks.

Frame · from £3,900

Complete bike · from £6,800

Two and a half hours. Nothing guessed.

00:00 → 02:30

01

00:00 · 20 min

02

00:20 · 15 min

03

00:35 · 30 min

04

01:05 · 25 min

05

01:30 · 30 min

06

02:00 · 30 min

01

00:00 · 20 min

The conversation

How you ride, how far, what hurts, what you want. The boring questions catch the most.

02

00:20 · 15 min

On the table

Flexibility, leg length, foot shape, old injuries. Your body sets the limits, not the bike.

03

00:35 · 30 min

The capture

Six markers, a 3D camera, and you riding at your normal effort. We measure every joint, every stroke.

04

01:05 · 25 min

Saddle & pressure

A pressure map under you, live on the screen. We change the saddle until the map goes quiet.

05

01:30 · 30 min

Cleats & bars

Millimetres at the foot, centimetres at the bars. We adjust, you ride, we measure again.

06

02:00 · 30 min

Your numbers

A fit sheet with every measurement, printed and emailed. Yours to take to any bike, or to us for a frame.

Your numbers become the frame.

We don’t pick a size. Five numbers from the fit set every tube, and we check each one against you.

Fit sheet · Maya R.

14.10.26

Saddle height

742 mm

Setback

68 mm

Reach to bars

512 mm

Bar drop

64 mm

Rides

6 h on gravel

Fit Nº 1240 · Frame SB-0186

Maya’s fit, 14 October. Each line becomes a dimension on her frame.

Frame SB-0186: Maya's brushed titanium gravel frameset with a black carbon fork, in side profile.

Seat angle

73.0°

Seat tube

520 mm

Chainstay

430 mm

Reach

386 mm

Stack

584 mm

Head angle

71.5°

Frame SB-0186 · Geometry

mm · degrees

Seat tube

520

Seat angle

73.0°

Reach

386

Stack

584

Chainstay · Head angle

430 · 71.5°

SB-0186 · Maya · Gravel · Ti 3/2.5 · Brushed

Prices, on the page.

If the fit says your old bike is fine, we’ll tell you.

3D capture

Pressure map

Cleats & bars

Follow-up

Frame

You leave with

Price

Fit Check

60 min

—

—

Saddle & bars

—

—

Your saddle and bars set, notes emailed

£120

Fit Check

60 min

3D capture

—

Pressure map

—

Cleats & bars

Saddle & bars

Follow-up

—

Frame

—

Your saddle and bars set, notes emailed

£120

Full Fit

2 h 30

Included

Included

Included

Six weeks

—

A fit sheet with every number, yours to keep

Full Fit

2 h 30

3D capture

Included

Pressure map

Included

Cleats & bars

Included

Follow-up

Six weeks

Frame

—

A fit sheet with every number, yours to keep

Two-Bike Fit

4 h

Both bikes

Both bikes

Both bikes

Six weeks

—

Two fit sheets, road and gravel

£390

Two-Bike Fit

4 h

3D capture

Both bikes

Pressure map

Both bikes

Cleats & bars

Both bikes

Follow-up

Six weeks

Frame

—

Two fit sheets, road and gravel

£390

Custom Frame

14 weeks

Included

Included

Included

Twelve weeks

Drawn & welded

A titanium frame with your number on it

from £3,900

Custom Frame

14 weeks

3D capture

Included

Pressure map

Included

Cleats & bars

Included

Follow-up

Twelve weeks

Frame

Drawn & welded

A titanium frame with your number on it

from £3,900

Complete Bike

16 weeks

Included

Included

Included

Twelve weeks

Drawn, welded & built

A finished bike, and a final fit on it

from £6,800

Complete Bike

16 weeks

3D capture

Included

Pressure map

Included

Cleats & bars

Included

Follow-up

Twelve weeks

Frame

Drawn, welded & built

A finished bike, and a final fit on it

from £6,800

A railway arch in SE1. The fit at the front, the welding at the back, and four people who ride what they build.

Inside a London railway arch: the pale grey fit studio in front, the titanium workshop and frame jig at the back.
Tomás Reyes, framebuilder, checking a titanium tube at the workbench.

Tomás Reyes

Framebuilder · Co-founder

Hana Webb tightening the stem bolts of a titanium bike in a repair stand.

Hana Webb

Finishing & assembly

Ines Okafor, fitter and co-founder, holding a goniometer against the studio wall.

Ines Okafor

Fitter · Co-founder

Sol Mendel crouching beside a rider to adjust the saddle height with a hex key.

Sol Mendel

Fitter · Gravel & ultra

Tomás Reyes, framebuilder, checking a titanium tube at the workbench.

Tomás Reyes

Framebuilder · Co-founder

Hana Webb tightening the stem bolts of a titanium bike in a repair stand.

Hana Webb

Finishing & assembly

Ines Okafor, fitter and co-founder, holding a goniometer against the studio wall.

Ines Okafor

Fitter · Co-founder

Sol Mendel crouching beside a rider to adjust the saddle height with a hex key.

Sol Mendel

Fitter · Gravel & ultra

Four people, four stations. Hover a marker to meet them.

4.9 · 318 reviews on Google

Twelve years of a sore left knee. Ines moved my cleat two millimetres and dropped the saddle five. That was it.

Daniel K.

Bermondsey

Cleat −2 mm

Saddle −5 mm

Questions, answered plainly.

01

Do I need a fit if nothing hurts?

02

Which bike should I bring?

03

Do I have to buy a frame?

04

Why titanium?

05

How long does a frame take?

06

I'm riding through pain. Can you fix it?

01 / 06

Do I need a fit if nothing hurts?

No. But most riders find a few watts and a lot of comfort they didn't know they'd lost. The Fit Check is a cheap way to find out.

Do I need a fit if nothing hurts?

+

Which bike should I bring?

+

Do I have to buy a frame?

+

Why titanium?

+

How long does a frame take?

+

I'm riding through pain. Can you fix it?

+

setback

Fit Nº 1240 · capturing

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