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Saddle height calculator

Your inseam through three published saddle height formulas, side by side.

cm
Units

To measure: back to a wall, feet about 5 cm apart, pull a book up firmly into your crotch, keep it level, and measure from the floor to the top of the book.

LeMond

74.2cm

0.883 × inseam

Bottom bracket centre to saddle top, along the seat tube

LeMond & Gordis, 1987

Genzling

74.3cm

0.885 × inseam

Bottom bracket centre to saddle top, along the seat tube

Genzling, 1980

Hamley & Thomas

91.6cm

109% of inseam

Pedal axle to saddle top, crank in line with the seat tube

From the BB: 74.3 cm with 172.5 mm cranks

Hamley & Thomas, 1967

Inseam 33.1 in A starting point, not a bike fit.

mm
Every inseam, 70–95 cm
InseamLeMondBBGenzlingBB109%pedal109%BB, 172.5
7027.6 in61.862.076.359.1
7128.0 in62.762.877.460.1
7228.3 in63.663.778.561.2
7328.7 in64.564.679.662.3
7429.1 in65.365.580.763.4
7529.5 in66.266.481.864.5
7629.9 in67.167.382.865.6
7730.3 in68.068.183.966.7
7830.7 in68.969.085.067.8
7931.1 in69.869.986.168.9
8031.5 in70.670.887.270.0
8131.9 in71.571.788.371.0
8232.3 in72.472.689.472.1
8332.7 in73.373.590.573.2
8433.1 in74.274.391.674.3
8533.5 in75.175.292.775.4
8633.9 in75.976.193.776.5
8734.3 in76.877.094.877.6
8834.6 in77.777.995.978.7
8935.0 in78.678.897.079.8
9035.4 in79.579.798.180.9
9135.8 in80.480.599.281.9
9236.2 in81.281.4100.383.0
9336.6 in82.182.3101.484.1
9437.0 in83.083.2102.585.2
9537.4 in83.984.1103.686.3

cm. BB = bottom bracket centre to saddle top; pedal = pedal axle to saddle top.

Genzling and the 109%-from-BB figure agree for mid-length legs and drift apart for short and long ones (Millour et al. 2019). Sources: Peveler et al. 2005; Bini et al. 2011; Millour et al. 2019; Millour & Bertucci 2017; Millour et al. 2020; Hamley & Thomas 1967.

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