Sizing a child the Frog way!


Here at Frog we take sizing a child very seriously. This is one of the most important factors for cycling success and enjoyment.

Unlike many kids' bikes, Frog bikes are sized based on leg length rather than age, since this is the most reliable way to find the right size bike for each child. Children are unique and come in all shapes and sizes, growing at different times, so age alone isn’t a reliable measure.


FIND YOUR FIT

In many cases, wheel size and age are used as methods to select a child's bike, but this is not accurate; you need to measure the inseam of the child's legs. This will ensure that your child is able to place their feet on the ground safely and comfortably.

We recommend taking the time to measure the rider’s inside leg by following these simple steps:

  1. Stand the child in socks against a wall
  2. Place a small book between their legs, as high as is comfortable
  3. Ask the child to move away and measure from the top of the book to the floor
  4. Once you have measured the inside leg, use the table below to find the right size of bike for your child

Current ModelsTentative Rider
Minimum
Inseam
Confident Rider
Minimum
Inseam
Confident Rider
Maximum
Inseam
Approx ageWheel
Size
Frame
Size
Size Fits
Tadpole Mini24cm (10")23cm (9")30cm (12")1-210" -23, 24, 25, 26, 27, 28, 29, 30
Tadpole32cm (13")31cm (12")41cm (16")2-312"-31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41
Tadpole Plus38cm (15")36cm (14")47cm (18")3-414"-36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47
Frog 4040cm (16")36cm (14")46cm (18")3-414"9"36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46
Frog 4444cm (17")40cm (16")53cm (21")4-516"9.5"40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53
Frog 4747cm (18")43cm (17")59cm (23")4-618"9.5" 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 54, 56, 57, 58, 59
Frog 5353cm (21")50cm (20")65cm (26")5-720"11"50, 51, 52, 53, 54, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65
Frog 6161cm (24")57cm (22")74cm (29")8-1024"12" 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74
Frog 6262cm (24")58cm (22")69cm (27")8-1024"12" 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74
Frog 6969cm (27")63cm (25")75cm (30")10-1226"14"63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75
Frog 7373cm (29")67cm (26")81cm (32")12-1426"16"67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81
Frog 7878cm (31")72cm (28")88cm (35")13+ 26" 18"  72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88
Frog City 5353cm (21")49cm (19")65cm (26")5-720"11" 49, 50, 51, 52, 53, 54, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65
Frog City 6161cm (24")57cm (22")74cm (29")8-1024"12" 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74
Frog City 6767cm (26")63cm (25")81cm (32")10-1226" 14"  63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81
Frog Road 58 / Track 5858cm (23")52cm (20")63cm (25")6-720"11"52, 53, 54, 54, 56, 57, 58, 59, 60, 61, 62, 63
Frog Road 67 / Track 6767cm (26")62cm (24")74cm (29")8-1224"14"62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74
Frog Road 70 / Track 7070cm (28")67cm (26")84cm (33")11-1426"17" 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84
Frog MTB 6262cm (24")58cm (23")70cm (28")8-1024"12.5" 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70
Frog MTB 6969cm (27")63cm (25")75cm (30")10-1226"15"63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75
Frog MTB 7272cm (28")66cm (26") 85cm (33")12+26" 16" 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85


Discontinued Tentative Rider
Minimum Inseam
Confident Rider
Minimum Inseam
Confident Rider
Maximum Inseam
Approx ageWheel SizeFrame Size
Frog 4343cm (17")39cm (15")52cm (20")3-414" 9.5" 
Frog 4848cm (19")43cm (17")54cm (21")4-616" 9.5" 
Frog 52 (Single speed)52cm (20")50cm (20")61cm (24")5-620"10"
Frog 52 (Hybrid)52cm (20")50cm (20")61cm (24")5-620"10"
Frog 5555cm (22")52cm (21")65cm (26")6-720"11"


WHAT ELSE SHOULD I CONSIDER?

Standover height and saddle height should also be factored into finding the right size bike for your child. This will ensure that your child can stand comfortably over the top tube (cross bar) of the bike and be able to touch the ground when seated on the bike allowing them to stop and start without toppling off.

Learn more about this here >>

FIND THE RIGHT BIKE

We recommend purchasing your Frog bike from your local Frog stockist, who will build the bike for you and ensure it fits your child properly.

Your local Frog Bikes stockist will have many of our bikes available for the rider to sit on in-store. You will get help and advice on sizing, and receive ongoing service, as well as support. Using our FrogFit App, stockists can recommend models based on arm length, inside leg measurement, and a rider's confidence level.

Find your local stockist >>



PLEASE NOTE we always recommend that you buy your Frog bike from your local Frog store, who will build it for you and ensure the fit is right for your child. Our bikes should always be built and checked by a qualified mechanic.