The traditional method of measuring frame size was based on studying a pool of accomplished cyclists and making assumptions. For example, if cyclist A and B have a leg length of x and they are riding a frame with a 58 seat tube, then if cyclist C has the same leg length, he should also ride a 58, and so on.
 This concept is the foundation for all sizing systems in use today. However people are creatures of nature and as such we are all different. We do not come out of nice moulds; we all grow differently. Therefore it is not only the length of a limb that plays a role in this puzzle, but size of joint, orientation of the joint, symmetry, fitness level and flexibility of the individual.
A new perspective was needed and therefore The Serotta Size-Cycle was born. The Size-Cycle is essentially an infinitely adjustable stationary bicycle. On it a trained technician will help you determine the optimal cycling position for you, based on your body, your fitness and your flexibility. From your position, the technician can then help you make the optimal decision on frame size selection and component selection. This will insure that your new (or newly fitted) bike will deliver the maximum performance. You will have maximum power, maximum comfort and maximum endurance. No hocus-pocus. Just the right fit.
A Serotta Size-Cycle and appropriately trained technician is available in the form of James Huggins, of Rock 'n' Road Cycles. If you like what you hear in this section please with your details and we will be happy to pass them on to James. James also imports the complete range of Serotta bikes from the USA so again if you are interested in further details and we'll do the necessary.
Stock Size or Custom?
A properly designed custom bicycle takes your biomechanical fit into consideration along with over-all balance and desired ride quality of the bicycle. Ideally everything is proportionate. Bigger people need bigger, stiffer, longer frames, longer cranks and longer stems. A properly proportioned fit is just as important for mountain bike cyclists as it is for road cyclists (and tourists).
Extreme conditions (very steep descents and climbs), abrupt sharp turns etc, make weight distribution a critical element of performance capability and safety.
Who needs a custom bicycle?
If you cannot achieve proper position on a bike even while changing seatpost and/or stem you may be a custom candidate. If you can achieve proper fit on your bike (or a new stock model) but find that you end up with a disproportionately long or short stem, or if your seat is out of travel or if your stem is dangerously high out of the frame, you are a good candidate for a custom frame.
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