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Transfer and adjust your bike fit

Enter your current bike. Then see how to set up a new frame to sit the same, or what a change to stem, spacers and handlebar does on your current bike.

1Your current bike
Frame

The search fills in the fields below. If your model is missing, enter the values straight from the manufacturer geometry chart.

Cockpit

Measured from the top of the head tube to the bar center, horizontally and vertically. Spacers are already included.

Saddle and cranks
2New frame

The search fills in the fields below. If your model is missing, enter the values straight from the manufacturer geometry chart.

Where do I find these values?

Stack, reach, head tube angle and seat tube angle are in the manufacturer's geometry chart, usually on the product page or in the catalog. Make sure to use the right frame size. How many spacers are possible depends on the steerer length, ask your shop. Manufacturers often specify a limit for carbon steerers.

How to set up the new frame

Both bikes overlaid

Schematic, aligned at the bottom bracket. Dots mark saddle and handlebar center.

Current bike New frame

Other cockpit options

Key figures

How mybikesetup calculates

All points are calculated in a coordinate system with the bottom bracket center as origin. The handlebar center follows from stack and reach, plus headset top cap, spacers and half the stem stack height along the steerer, then the stem. A 0° stem sits perpendicular to the steerer, so on a 73° head tube it points 17° upwards.

The saddle sits on the seat tube line at saddle height, shifted by seatpost setback and rail position. With a different crank length the saddle moves down or up by the difference, a common rule of thumb.

For the new frame every combination of common stem lengths from 60 to 140 mm, stem angles and spacers in 5 mm steps is calculated and sorted by distance to your current handlebar center. For the saddle, seatposts with 0, 15 and 25 mm setback and ±20 mm of rail adjustment are assumed. If you enter only certain stem sizes, for example those of an integrated cockpit, only these are calculated.

Head tube length is part of stack, which is measured to the top of the head tube. A longer head tube therefore shows up as a higher stack. If the best stem is 130 mm or longer, 70 mm or shorter, or the spacers are not enough, the calculator suggests checking another frame size.

The hands are the bar center plus handlebar reach forward and rise upward. A bar with rise lifts the hands without moving the clamp. In the adjust mode, frame and saddle stay the same, only stem, spacers and handlebar change.

Rating up to 5 mm as a fit and up to 15 mm as noticeable is an assumption. How sensitive someone is to changes varies. If you have discomfort or make big changes, a professional bike fit is worth it.