May 20, 2012 Mechanics No Comments

Humans are not all made from the same template, so sizing a bike can be pretty difficult. The main rule to follow is that the bike should always fit the rider, not the other way around. If you can get the frame size close enough, then you can make fine adjustments by tweaking the seat and handlebar configuration and maybe changing the stem to increase or decrease reach.

We do frames in three sizes at present for both versions of our frames V1: 18.5″, 19.3″, and 20″ and V2 comes up a bit smaller at 52cm, 55cm and 59cm.

The V1 frames harken back to an age when path racers were all the rage and the bicycle was the steed of the gentry. The geometry is quite relaxed, making it ideal for urban and country riding, while still giving you a good perspective on what’s going on around you and more importantly, remaining comfortable.

The V2 lugged frame is tighter in geometry making for a more sporty ride and a bit more of an aggressive position.

The chart below should give you some idea of the size to aim for based on either your height or your inseam but the bike can be fine tuned by raising or lowering the seatpost; raising or lowering the handlebar stem; shifting the saddle back and forth; or changing the stem for a different length. We put shorter stems on smaller bikes and longer stems on larger bikes to better accommodate the reach of the rider and our frames are unisex – they have a slight slope to the top tube, which is more apparent on smaller frames to reduce the stand over height.

Our size is measured by the length of the seat tube, from the centre of the bottom bracket (where the cranks connect) to the centre of where the seat tube intersects the top tube. To take reach into account we put small stems on small bikes and long stems on large bikes, this moves the bars further away or closer to the rider.

Small frames have a stand over height of about 29″, medium 30″ and large 31″.

If you’re not sure, just ping us a message and we’ll help out, even if it means tweaking the setup to get you what you want.

8ballbike sizing

Rider Height Rider Inside Leg Recommended Frame Size CM Recommended Frame Size Inches Bike/Frame Size
5’5″ – 5’7″ 29″ – 31″ 52cm 18.5″ Small
5’7″ – 5’9″ 30″ – 32″ 52cm 18.5″ or 19.3″ Small or Medium
5’9″ – 5’11″ 31″ – 33″ 55cm 19.3″ Medium
5’11 – 6’2″ 32″ – 34″ 59cm 20″ Large
Written by james