Bike Fit

Before You Start

This calculator is designed to help you replicate your road bike position on the Wattbike Pro, Trainer or Atom.

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

  1. 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.

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

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

    80mm
  4. 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.

     
  5. 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 By Bx Cy Cx
  6. 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 Ax By Bx Cy Cx
  7. 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.

    Ay Ax By Bx Cy Cx
  8. Measure the length of the plumb line you dropped down from the centre of the bottom bracket in the previous step. This is By.

    Ay Ax By Bx Cy Cx
  9. 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.

    Ay Ax By Bx Cy Cx
  10. Measure the length of the plumb line you dropped down from the centre of the shifter hoods in the previous step. This is Cy.

    Ay Ax By Bx Cy Cx
  11. Measure your crank length.

     

Your Results

  1. Please complete the 'Taking Measurements' step first.

    Choose the Wattbike model you are applying your bike fit to.

     
  2. 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.

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

  4. Enter your email address below and we'll send you a copy of your Bike Fit results.