bikzerArmrest coordinates matter
Pad stack and pad reach describe armrest position relative to a frame reference. Brands can use different measurement conventions, so read the model documentation. Check the adjustment ranges for each size and which parts are needed to reach them.
Do not copy a road frame label
Riding on extensions changes contact points and weight distribution. A matching frame number does not show that your position is achievable. If you have fit coordinates, compare them with the exact model and year’s adjustment tables.
Before committing to a purchase
This calculator filters general body measurements; it does not assess mobility, event duration or armrest coordinates. Verify the actual adjustment range and consider an individual assessment. A lower-looking position does not automatically mean better performance if you cannot sustain it or control the bike.
Frequently asked questions
Does this calculate an aerodynamic position?
No. It gives a frame reference from height and inseam. Position needs additional measurements and checks on the bike.
What is pad reach?
It describes horizontal armrest position. The exact reference point depends on the manufacturer’s documentation.
Can extensions compensate for any frame size?
No. Adjustments have limits. The frame and cockpit must support the required coordinates within those limits.