• Discussion on your choice of builder, what you’d like to achieve with the purchase

  • Assessment of either existing bike, bike fit data, or frame draft from manufacturer

  • CAD drawings based on supplied data (includes prelim, adjusted and final versions)

  • 1.5 hours

  • £130



  • Discussion on your choice of builder, what you’d like to achieve with the purchase

  • Contact point fit on sizing jig to establish best frame dimension requirements

  • CAD drawings based on jig fit data (includes prelim, adjusted and final versions)

  • 2 hours

  • £180



Custom frame design comprises three main geometric aspects. These are handling aspects, rider position aspects, and aesthetic aspects. How these elements combine gives you your finished product.

And who decides on how they combine? Well, it depends on who you’re having your bike built with.

  • Handling aspects: 90% of the time these aspects can and should be handled by the builder, providing that builder has sufficient knowledge and experience to engineer what you require. But don’t assume they do. On occasion, builders – particularly in the far east – will take the lead on everything, includinh handling aspects, from you, the buyer. This means that in the absence of that knowledge, someone else will have to make those decisions.

  • Rider position aspects: 90% of the time this should be decided by both a bikefitter and you. Some bike builders have sufficient knowledge of fitting to position riders correctly, but never assume that they do. Many very good bike builders have just a rudimentary knowledge of fitting, and can thus create your bike around an imperfect position. In these cases, being armed with the knowledge yourself is extremely beneficial. And in all cases it dramatically reduces the possibility of things going wrong.

  • Aesthetic aspects: Some of the time, particular bikes or models will have their own inherent aesthetic, and the only changeable things will be the rider positioning aspects. In other cases the design is “open” and allows you, the buyer, to specify what you’d like from the aesthetics. In order to make those decisions, the buyer has to know what specifics to look and ask for. The question is, how does one make aesthetic decisions within the constraints of handling and positional needs?


The key to combining your elements is balance. Consideration has to be made of all three aspects, as well as include component choice and the ethos/mindset of the builder or brand. Getting a custom frame is about establishing where the best place is to make compromises and where not to; how to navigate restrictions whether these be physiological, component choice, or a challenging aesthetic.

The FORM custom frame design service takes you through the process of understanding what elements need deciding on, how those decisions should be made, and how to adjust everything into a pleasing aesthetic. It informs you of choices and details a builder might not consider, and teaches you to understand your own riding position in relation to the whole design.

In effect it puts you in the driving seat of the ordering process, with boundaries and parameters from which you can make the all-important decisions – important when walking mostly blind in a custom frame purchase. The kind of investment involved in purchasing a bespoke frame requires an equal measure in knowledge of what to ask for.