Size & setup chart
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To figure out what size Giant Bicycle you may require please download our sizing chart
For a normal road bike set up, follow these steps as recommended by Giant Bicycles:
1. Measure your inseam
Measure your inseam in centimeters (crotch-to-floor measurement without shoes). The best way to do this is to stand with your back flat against a wall and your heels as close to the wall as possible. Next, take a hardback book that is approximately two inches thick and place it vertically as far up into your inseam as possible and so that the edge is flush with the wall. Make sure that the book protrudes enough so you can measure from the top edge of the book down to the ground.
2. Check For Proper Leg Extension
Rider must be wearing cycling shoes with cleat system in place. It is best to have the bike stabilized in a trainer or with the rider leaning against a wall while seated on the bike. Multiply inseam by .883 to determine approximate saddle height (measured from bottom bracket spindle to top of the saddle). With the ball of the foot directly over the pedal spindle and the crankarm at the bottom of the pedal stroke (6 o’clock) there should be a slight bend to the knee (approximately 30 degrees from completely straight). Adjust saddle height as needed.
3. Set Saddle Fore/Aft Position.
After determining the correct saddle height and leg extension, have the rider sit on the bicycle and rotate the crank so that the pedals are at 3 and 9 o’clock. When viewed from the side, the front of the knee should line up over the axle of the pedal.
4. Determine Top Tube/Stem Length Combination.
With the rider’s hands on the handlebar’s lower “drop” position, there should be a slight bend to the elbows, with about 3-4 inches of distance between elbow and knee when the crank arm is in the 3 o’clock position. Also, with the rider’s hands in the drop position or on the tops of the brake levers (brake hoods), the middle section of the handlebar should obscure the front wheel’s hub from the rider’s view. If proper top tube/stem length combination cannot be achieved with a 105-135mm stem, try the next size (larger) frame.
Handlebar height and saddle height should combine to position the rider with a relatively flat back when the hands are in the drop position. However, a more or less aggressive position can be achieved by using a flip-flop stem that has an angled arm. It may take a couple of rides with a couple of different stems to finally settle on the correct rider compartment fit.
