What Size Cranks Do I Need For My Road Bike?

“What size cranks should I have?” is a common question for cyclists, as crank length plays a crucial role in optimizing pedaling efficiency and comfort. To determine the right crank length for your bike, consider factors such as leg length, inseam measurement, and your height.

1. Leg Length Measurement: Begin by measuring your leg length. This measurement is typically done in centimeters (cm) and involves measuring from your crotch to the ground while standing with your feet about shoulder-width apart.

2. Inseam Measurement: Next, calculate your inseam measurement in centimeters. This is the length from the crotch to the floor, and it can be used as a more precise indicator of your leg length.

3. Height, Male and Female: Match your leg length or inseam measurement to the corresponding recommended crank length in millimeters (mm). The chart below provides a general guideline for both male and female riders based on their height and leg/inseam measurements:

   • For individuals with leg lengths or inseams up to 83.5 cm (up to 5′ 5″), crank lengths between 162.5 mm and 177.5 mm are recommended.

   • If your leg length or inseam falls between 83.5 cm and 86 cm (5′ 5″ to 5′ 8½”), consider crank lengths between 172.5 mm and 183.5 mm.

   • Riders with leg lengths or inseams ranging from 86 cm to 89.5 cm (5′ 8½” to 5′ 11½”) may find crank lengths between 177.5 mm and 188.5 mm suitable.

   • Finally, for those with leg lengths or inseams exceeding 89.5 cm (taller than 5′ 11½”), opt for crank lengths between 183.5 mm and 192 mm.

Remember that these are general guidelines, and personal comfort and riding style can also influence your choice of crank length. Experimenting with different crank lengths and seeking advice from experienced cyclists can help you determine the perfect fit for your cycling needs.

Considering 165mm Cranks: Exploring the Benefits for Cyclists

Many cyclists often ponder the question: “Should I use 165mm cranks?” To shed light on this query, let’s delve into why shorter cranks, specifically 165mm cranks, are favored by experts. These cranks offer several advantages, particularly for typical adult male riders:

1. Improved Aerodynamics: Shorter cranks, such as 165mm ones, enable riders to adopt a deeper and more aerodynamic riding position. This benefit is especially valuable for sprinters and time trial enthusiasts who seek every possible advantage to reduce wind resistance and gain speed.

2. Enhanced Pedaling Efficiency: Another significant advantage of using 165mm cranks is that they allow for a more fluid and comfortable pedaling motion. This can result in increased pedaling efficiency, reduced fatigue, and potentially improved performance over longer rides.

In summary, 165mm cranks hold promise for cyclists looking to optimize their riding experience. By promoting better aerodynamics and pedaling efficiency, they have garnered the attention of experts and riders alike. This information is current as of September 16, 2022.

Leg Length Measurement

Crank Length(mm)	Inseam(cm)	Height, Male and Female*
162.5	77	Up to 166.3 cm Up to 5′ 5″
170	81 – 83.5	173 – 179 cm 5′ 8″ – 5′ 10½”
172.5	83.5 – 86	179 – 185.5 cm 5′ 10½” – 6′ 1″
175	86 – 89.5	185.5 – 192 cm 6′ 1″ – 6′ 3½”