What kind of help do you need?

Go to the size guide under the product page and select “Start”. Enter your height in feet and inches and, if available, your inseam measurement. Select “Next,” and the Perfect Fit System will recommend the frame size that most closely matches your measurements.

This recommendation is a starting point. Your proportions, flexibility, riding style, and preferred position can also affect your ideal size.

When two sizes could work, consider the riding position you prefer. The larger size will generally provide a taller, more upright position, while the smaller size will typically feel lower and more aggressive.

For example, an RS7 rider who is 6'3" may fit either an XL or XXL, depending on body proportions and positioning preferences. Compare the stack and reach of both sizes with your current bike, paying particular attention to cockpit length and saddle height. If possible, schedule a professional bike fit or test ride before purchasing.

Complete geometry charts are available on the individual bicycle product pages. Select your model and scroll to the geometry section to compare measurements across all available sizes.

Important measurements include stack, reach, effective top-tube length, standover height, head-tube length, and seat-tube angle. If you already own a bike that fits well, comparing its stack and reach with the X-LAB geometry is one of the most useful ways to select a size.

Branta™ cranksets are available in the following lengths:

• 160 mm
• 162.5 mm
• 165 mm
• 167.5 mm
• 170 mm
• 172.5 mm

Available chainring combinations include 50-34T, 52-36T, and 54-40T.

Shorter crank arms may benefit riders seeking additional hip clearance or a higher cadence, while chainring selection determines the available gearing range. Before ordering or changing components, confirm compatibility with your bicycle model, drivetrain, front derailleur, and power-meter configuration through an authorized X-LAB dealer.

Yes. Branta™ integrated cockpits are offered in multiple width and stem-length combinations. There are 18 size combinations for the RS7, AD8, and AD9, three options for the RT9, and three available stem lengths for the GT8.

360mm width

• 90mm × 360mm
• 100mm × 360mm
• 110mm × 360mm
• 120mm × 360mm
• 130mm × 360mm
• 140mm × 360mm

380mm width

• 100mm × 380mm
• 110mm × 380mm
• 120mm × 380mm
• 130mm × 380mm
• 140mm × 380mm

400mm width

• 100mm × 400mm
• 110mm × 400mm
• 120mm × 400mm
• 130mm × 400mm
• 140mm × 400mm

Unmounted cockpits may be eligible for exchange within 30 days. Availability and compatibility depend on the bicycle model and requested size. Because changing an integrated cockpit may require rerouting or replacing brake hoses and electronic-shifting wires, installation should be completed by a qualified bicycle technician. Contact your dealer before installation to confirm exchange eligibility and parts availability.

X-LAB bicycles can be test-ridden through participating authorized dealers. Use the X-LAB dealer locator (https://xds.co/pages/dealer-locator) to find the closest location.

Inventory and demonstration models vary by dealer, so contact the shop before visiting to confirm that it has the model and frame size you would like to ride. A dealer can also help compare sizes, review cockpit options, and recommend adjustments based on your preferred riding position.

T700, T800, and T1100 identify different carbon-fiber families with different strength, stiffness, elongation, and processing characteristics. T700 is generally classified as a standard-modulus fiber, while materials such as T800 and T1100 are designed for higher-performance applications.

A higher number does not automatically mean that an entire bicycle frame is lighter, stiffer, or better. Frame performance depends on how engineers combine the fibers, the direction and number of carbon layers, the resin system, tube shapes, and manufacturing process. Different fibers may be used in different areas of a frame to balance weight, stiffness, strength, impact resistance, comfort, and durability.