Bike fit calculator

Before You Start

This calculator is designed to help you replicate your existing road bike position on the Wattbike Pro, Trainer, Nucleus, Atom or AtomX. For a complete bike fit or time trial fit please consult a professional bike fitter.

Before you start, make sure you have the following tools:

  • Tape measure
  • Plumb line
  • Masking tape or electrical tape
  • Marker pen
  • Somewhere to record your measurements e.g. paper, phone

Taking measurements: Step 1/12

You will need to take six measurements, which will establish the x and y coordinates of the saddle and the hoods relative to the bottom bracket.

Taking measurements: Step 2/12

Place the bike so that the rear wheel is against a wall, or similar. Make sure it is upright and will not fall over.

Taking measurements: Step 3/12

Use the tape measure to identify the point where the saddle width is 80mm, and mark this with tape and a pen.

80mm

Taking measurements: Step 4/12

On the floor, run a tape measure from the wall to approximately the centre of the front wheel. The tape measure should be as close to the centre line as possible and in alignment with the bike. Use some tape to hold the tape measure in place, and lock the tape measure if possible.

Taking measurements: Step 5/12

Drop a plumb line down from the saddle at its 80mm width to the tape measure on the floor. The measurement at which the plumb line bisects the tape measure is Ax.

Ay Ax

Taking measurements: Step 6/12

Measure the length of the plumb line you dropped down from the saddle at its 80mm width in the previous step. This is Ay.

Ay

Taking measurements: Step 7/12

Drop a plumb line down from the centre of the bottom bracket to the tape measure on the floor. The measurement at which the plumb line bisects the tape measure is Bx.

By Bx

Taking measurements: Step 8/12

Measure the length of the plumb line you dropped down from the centre of the bottom bracket in the previous step. This is By.

By

Taking measurements: Step 9/12

Drop a plumb line down from the centre of the shifter hoods to the tape measure on the floor. The measurement at which the plumb line bisects the tape measure is Cx.

Cy Cx

Taking measurements: Step 10/12

Measure the length of the plumb line you dropped down from the centre of the shifter hoods in the previous step. This is Cy.

Cy

Taking measurements: Step 11/12

Measure your crank length.

Taking measurements: Step 11/12

Choose your Wattbike model

Your measurements

Loosen the saddle height lock lever, then move the seat stem up or down to the ???? position. Tighten the lock lever again, taking care not to over-tighten.

Targeted, effective training requires precise, accurate data and your Wattbike setup should be no different. Use the settings below to accurately replicate your road bike setup on your Wattbike:

Measurement Calculation
Saddle height standard: Error
Saddle fore/aft: Error
Handlebar height: Error
Handlebar fore/aft: Error
Saddle Height Extra Long Stem: Error
Saddle fore/aft extra-long: Error
Saddle fore/aft standard reversed: Error
Saddle fore/aft extra-long reversed: Error