Bike Fitting

Our bike-fitters Gill, Roger and Phil, have years of fitting knowledge, and experience, and are all qualified (SICI) bike fitters. We know that when it comes to fitting, experience counts for far more than the latest lazer guided measuring tool. Between us we have a folio of hundreds of fits on every type of rider including world class athletes in road cycling, triathlon and extreme challenge events, but we have also worked with and fitted many club cyclists, sportive riders and commuters. Everyone has benefitted from our time and expertise.

We have a hollistic and hands on approach to bike fitting. Our fitting style focuses on assessment; we spend a great deal of time just watching you pedal. It’s important to see you as a whole person, not just a set of angles.

Fitting is a service we offer free of charge with custom bikes bought from Mosquito. We also offer fitting to people with existing bikes or those buying stock frames.

Why should I have a fitting?

Knowledge in the areas of biodynamics and power output is so much greater now than in the past. This new research allows us to cycle further and faster than ever before. People are riding their bikes more and more but injury and discomfort are also on the rise. The correct position on your bike reduces the risk of injury considerably and, with pain banished, riding becomes a pleasure.

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Who is it for?

We often hear “I bought this great bike, just like the one my favourite pro rides but when I get off it I have terrible back pain”, or even worse, “after half an hour on it I am in agony”.
A few unfortunate home truths: most people who take up cycling are not as flexible as pro riders; most do not have the amazing core strength of pro riders; and most are not able to perch on a narrow firm saddle for long. These facts in themselves are not a problem, they just need to be addressed and ideally before you purchase your dream bike.

What difference will it make?

Bikes come in all colours and sizes but more importantly they come with many different geometries.
This allows us to find a bike that is the right fit. With the correct alignment of the lower body and bringing the upper body into its optimum position you will generate power far more efficiently.
The method we use is a holistic one, we work with the rider, taking into account that each of us is different.

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What do we do?

We spend time understanding what type of cyclist you are. We find out about any injuries or issues and we want to know all about your goals. The fit process assesses stability and flexibility and then we will work through the alignment and positional changes on the adjustable jig.
The measurements from the jig are uploaded into a programme and can be used to design a custom bike from scratch or to cross-reference with any existing bike geometry and assess its suitability.

After the fitting you will receive the results with an explainstion of the numbers and the position. We will also provide you with all drawings of custom bike geometry or non-custom bike suggestions or existing bike set up as appropriate.

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A bike fit at Mosquito can be booked Monday to Saturday (9-6pm), with some early morning and later night Thursday slots also available. The process takes around two hours and the rider will need cycling kit and cycling shoes (or suitable shoes). The bike fit costs £180.

  1.  Personal Interview – The fitting process starts with an interview. Here the rider’s personal information is entered onto an Excel spreadsheet. Not just age, weight, level of fitness, cycling experience and type of riding are recorded here, but also details that will help determine the final position, such as injuries that might affect riding comfort or efficiency. If you suffer from lower back pain or have a weak left knee, now is the time to own up because it’s all taken into account.
  2. Inseam Measurement – Next comes the measuring stage. Using a telescopic inseam-measuring device placed in between the legs, we take the inseam measurement minus shoes. Being spring-loaded, the device forces up underneath a rider, mimicking the effect of bodyweight pressing down on a saddle. The type of shoe and cleat the rider uses are also recorded.
  3. Shoulder Measurement – Shoulder width is taken next. This is a major factor in the width of bar recommended.
  4. Feet Measurement – Feet next! The weighted and unweighted measurements are taken for left and right, and a size of cycling shoe is suggested. The arch is also checked to see whether the rider pronates or supinates, in which case stabilising footbeds might also be recommended in the final report.
  5. Flexibility – Flexibility is the thing most cyclists don’t pay much attention to, but it actually plays a large part in the way your final, optimised position is determined.
  6. Sizecycle Set Up – With the body measurements and flexibility tests done, it’s time to set up the SizeCycle jig. Based on what we have seen we set the saddle height and make an educated guess at other factors including bar height to start with.
  7. Cleat Adjustment – Badly positioned cleats can be at the root of all sorts of injuries. Stopping the foot at key points in the stroke to check the position of the cleat in its float. The top and bottom of the stroke are the points where there is most variation in terms of instability.
  8. Saddle Height – Accurate saddle height is set using the angle of the knee when the foot is at the bottom of the pedal stroke. Getting the saddle height right is an ongoing process throughout the fitting.
  9. Saddle Fore & Aft – We measure the knee over the pedal spindle using a plumb line. The tibial tuberosity (just below the kneecap) should be directly above the spindle. Saddle setback is adjusted at this point.
  10. Upper Body – We aim for a ‘neutral spine’ position, so making adjustments to the stem length and bar height is crucial. We aim for the spread of the rider’s weight between saddle and bars at something like 60:40. So the last piece of the jigsaw is to get the stem length and the hand position right.
  11. Final Measurements – The measurements are transferred from the jig to Bikecad software and from here we can order your custom frame or work out the best off-the-peg frame for you, then set it up with the correct length stem, stem rise, headset spacing, saddle height, saddle setback position and saddle-to-bar drop. You get a copy of everything through the post, including a CD with all the interview, flexibility and jig data plus the photos of you with the optimised position, to use for future bike set-ups or custom builds.

Mosquito Bikes

123 Essex Road



N1 2SN

t:020 7226 8765


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Opening Times

Monday 8.30 – 6.30
Tuesday 8.30 – 6.30
Wednesday 8.30 – 6.30
Thursday 8.30 – 7.30
Friday 8.30 – 6.30
Saturday 10 – 6
Sunday Closed

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