For kids bike sizes, use the method below. For Adults, refer to the geometry charts below.

The best way to size your rider’s new bike is by Inside Leg measurement, as there is a large spread of leg lengths/heights for each age. This is easy and only takes a few seconds;

Stand your rider in socks against a wall
Put a small book between their legs (like a saddle, high as comfortable) and against the wall
Ask your rider to move away, measure from the top of the book to the floor, using cm or inches.

We list Minimum Inside Leg our kids race bikes (full Geo listed below for Adult bikes) on each product page. We measure from the floor up to the top-tube, in-front of the saddle, then minus 2-4cm for shoes, depending on age...

The chart below lists HUP bikes approx dimensions, when built to a standard spec. Using 650b (on a 700c frame) = 3cm lower standover. Flat bar builds (on a drop bar bike) = suitable for a 5cm shorter rider...

HUP evo:

evo24

Actual Standover (floor to top-tube, just in front of saddle nose): 54cm

Size Guide (height/inside leg): 110cm+ (49-59cm)

700c Kids Sizes

Actual Standover (floor to top-tube, just in front of saddle nose): 37cm: 64cm | 44cm: 67cm | 48cm: 71cm

Size Guide (height/inside leg): 37cm: 125cm+ (59-69cm) | 44cm: 138cm+ (64-77cm) | 48cm: 145cm+ (68-78cm)

700c Adult Sizes

HUP evo SL:

700c Kids Sizes

Actual Standover (floor to top-tube, just in front of saddle nose): 37cm: 65cm | 44cm: 68cm | 48cm: 72cm

Size Guide (height/inside leg): 37cm: 130cm+ (64-73cm) | 44cm: 144cm+ (67-77cm) | 48cm: 148cm+ (70-80cm)

HUP straatrace:

Adult Sizes

HUP azure:

Standover (floor to top-tube, in front of saddle): 37cm: 63cm | 44cm: 67cm | 48cm: 71cm
Size Guide (height/inside leg): 37cm: 125cm+ (59-69cm) | 44cm: 138cm+ (64-77cm) | 48cm: 145cm+ (68-78cm)

Standover (floor to top-tube, in front of saddle): 50cm: 74cm | 52cm: 77cm

HUP enduro:

Component Sizing Guide

Drop Handlebars: match the approx shoulder width for Road, or shoulder width +1 size up for Cyclocross

Flat Handlebars: match the approx width of their press-up position (go narrower for XC, wider for Enduro)

Kids Cranks: take 10% of their height +5mm for crank length (Road & Triathlon cycling) or 10% of their height +10mm for crank length (Off-Road cycling). Example: 1350mm tall rider would choose 140mm for Road bike or 145mm for CX/MTB.

Stems: This isn't an exact science, but generally if the rider is at the lower end of the frameset's growth range, a shorter stem will be correct and vice-versa.

Saddle/Post: Our kids saddle is suited to younger riders and the Youth saddle for older riders (or younger riders Off-Road). Youth, XC and Gravel saddles are all perfect to Adults. We have 2 choices of seat post, inline or rotary, the later is very useful for smaller riders at the lower end of the frameset's growth range being reversible to reduce the bikes effective length.

Kids Clothing Size Guide

Sizing Guide for HUP cycling clothes: Cycling Jerseys, Bib-Shorts and Bib-Tights.

	CHEST	WAIST	HEIGHT	AGE
SIZE 1	63-68	57-62	116-125	6-7
SIZE 2	69-74	63-69	126-135	7-8
SIZE 3	75-80	70-75	135-143	8-9
SIZE 4	81-86	76-81	143-150	9-10
SIZE 5	87-92	82-86	151-157	11-12
SIZE 6	93-98	87-92	158-163	13-14

Sizing Guide: frames, components & clothing

Bike Size Guide