Sizing Your Trike




The seated measurements are made with the rider sitting on the floor with his/her back firmly against a door or wall. With legs and arms straight out in front, and taken from the floor or the wall. Leg measurement is to the bottom of the shoe, and arm to centre of the clenched fist. With the Seated Leg measurement it is MOST IMPORTANT to have your backside firmly against the wall – if this is not possible, then please use a step, or a book against the wall and take off the thickness of the book from the overall measurement. Hip Width is a strictly two-dimensional measurement, as though one was measuring from a life-size photo of themselves. These measurements are needed to help select the RIGHT FRAME SIZE, and to improve the fit of our trikes.

Height – This is to be used as a general overview and to check that seated shoulder height and leg lengths sound correct if working with someone you have not seen yourself. Height alone will not give you a frame size. It doesn’t take long to get used to working with these types of figures.

Inside leg – This is used for crank length. We offer 170 and 175mm as standard but Specialite TA Cranks are also on offer as an up-grade and range from 155 – 185. We stock them in 5mm increments. There is a calculator in the sizing charts, but here’s a general chart based on the calculator.


Weight – This is to be checked against the sizing charts to make sure that people don’t go over the limits of the trike. Other factors can also be looked into such as weight to be carried, and terrain. For Example, someone slightly over who is only using the trike to pick up mail once a week could go over the limit. A lighter weight retired couple doing fully self-contained touring, should look at a heavier duty frame. Weight limits are based on an average luggage capacity of 44 lbs. Our GTO Alloy rack can handle up to 66 lbs., and GTO Cromoly racks up to 88 lbs. So any weight over 44 lbs. should be added to the rider weight.

Seated leg (X-seam) – This is the most crucial measurement and should fit between the Min. and Max. ratings on the sizing chart. Our frame sizes have been designed with a certain amount of overlap. If people fall into the middle ground, seated shoulder height is then looked at. For tandems you need to look at both Capt. and Stoker. People generally prefer the shorter of the two frame sizes if they fit otherwise use the larger size. Stoker minimum leg length can go right down to small children and depends somewhat on Crank size. I’m suggesting 32″ with the 170’s before they run the risk of having their heals hit the seat.

Seated shoulder height – This is used mainly for people that could be one of two different frame sizes. This is a very general thing, and what one person may be comfortable with doesn’t mean another will. It’s best to get people on the trike and see. Our seats lengthen and shorten relative to the different size frames. This measurement is in reference to the top curve of the seat supporting the person’s upper back (shoulder blades). Here is a general chart of people’s seated shoulder heights.


Shoulder width and Seated arm length (clenched fist) – These two are mainly used for speciality trikes like the Hand Crank models and for people with beyond average physical differences. Shoulder width can be used as a rough guide for seat width sizing.

Hip width – This is used to determine Seat and/or Handle Bar width. As standard, our trikes have 360mm wide seats and 550mm wide Handle Bars. Our wider option consists of 400mm wide seat and 600mm wide Handle Bars. For Hip widths over 18″, 600mm Handle Bars will be needed. Most people between 18″ and 20″ find that the 360mm seat however, is still comfortable. It all depends if the seat rails feel uncomfortable. For Hip widths over 21″ we would need to consider 650mm handle bars and possibly even a wider trike for 22″ and over.