Bicycle Fitting and Sizing

Serotta

Serotta has been a leader in bicycle fit for quite a while. The established the Serrotta Cycling Institute to further the goals of a better understanding of bike fit.

Fit Bikes

• Calfee Sizer Cycle
• Serotta Fit Bike
• San Giorgio Fig Jig

Local Fitters

• NorCal Cycling in Santa Rosa. $75. They do a pretty good job. Much better than the average bike shop in the bay area. This is where I send most people that need a basic fitting.
• Whole Athelete, San Anselmo, CA, $220-295
• Craig Upton of Performance Lab HC , $150
• PK Racing, in Fairfax. $450-500. Primarily pro road/tri experts. They are very expensive and I have no personal experience with them other than the fact that they are only 3 blocks from my house.
• Cycle Sport, in Oakland. $125

or search Serotta by zip code

Links

• Jack's Bikes - A fit kit walk through
• Cyclemetrics link page

Some Traditional Numbers

Crank Length

18.5% from top of femur to floor.

• Inseam to 31 inches: 170 mm.
• Inseam 31 to 33 inches: 172.5 mm.
• Inseam 33 or more inches: 175 mm.

Knee Angle

30-35 Degrees. More bend conserves more energy, less bend for more power.

Saddle Height

Inseam x 0.883 = Top of the saddle to the center of the bottom bracket.

Trunk Angle

About 30-40 degrees from level. (45 at most)

Shoulder Angle

90-100 degrees.

Elbow Bend

15 degrees

Stem Length

When in drops, axle obscured by bars.