Frog Bikes Track Size Comparison: 58, 67 and 70
A Frog Bikes Track size comparison should keep the complete bicycle in view. Track 58, Track 67 and Track 70 have different crank lengths, handlebars and listed frame dimensions. The Japanese distributor Podium records these details separately. Its approximate ages help identify the catalogue entries, but they do not establish whether a particular child can control a particular bicycle.
Frog Bikes Track size comparison: Start with documented differences
The clearest progression appears across several components together. Podium lists 114mm cranks and a 320mm drop bar for Track 58, 127mm cranks and a 340mm bar for Track 67, then 140mm cranks and a 360mm bar for Track 70. Moving between models changes more than the number printed on the frame.
| Model | Crank | Chainring | Drop bar |
|---|---|---|---|
| Track 58 | 114mm | 36T | 320mm |
| Track 67 | 127mm | 40T | 340mm |
| Track 70 | 140mm | 44T | 360mm |
The listed seat tubes also differ: 300mm, 365mm and 432mm respectively. Those dimensions describe the named frame tubes. They are not the child's inside-leg measurement, a minimum saddle height or an instruction to select a bike by matching two numbers.
Separate a catalogue comparison from a fitting
Record the child's current height and inside-leg measurement before arranging a fitting. Ask the stockist and session coach to check mounting, position and reach on the actual bicycle. A child who has grown since the last season needs a fresh assessment; an old size recommendation is only a record of an earlier fit.
Check the example being offered
Bring the model name, photographs and the supplier's specification to that appointment. A used bike can have changed bars, cranks, pedals or wheels. If one part differs, compare the installed part rather than assuming the remainder still matches a catalogue. Ask who made the change and keep any fitting or service record.
Podium's pages contain conflicting nominal wheel descriptions, so this comparison does not resolve a wheel purchase from those headings. Read the actual tyre and rim markings instead. Its published specifications are also subject to change; this is a comparison of those entries, without an invented model year or promise about current stock.
Choose for the planned session
All three entries say brakes are not supplied. Before buying, speak to the venue about its supervised sessions, accepted bicycle configuration and fitting arrangements. A familiar drop handlebar does not make the Track range interchangeable with a child's braked road bike. The venue's answer belongs alongside the measurements, rather than after the purchase.
The Frog Bikes introduction explains the wider children's range. Use the Frog Bikes topic to explore individual equipment questions once the basic category is clear. A useful Frog Bikes Track size comparison ends with a short list for a real fitting, rather than an age-based promise.
FAQ
Does Track 67 mean a 67cm seat tube?
No. Podium lists its seat tube as 365mm. Keep the model name separate from a named component dimension.
Are the three crank lengths identical?
No. The entries list 114mm, 127mm and 140mm for Track 58, 67 and 70 respectively.
Can approximate age replace a fitting?
No. The child's measurements, actual bicycle and ability to manage it need assessment together.
Sources
Podium’s three Track entries provide the named crank, chainring, handlebar and seat-tube comparisons. Their approximate ages are not individual fitting results; inconsistent nominal wheel wording is not used as a replacement specification. Podium Frog Track 58 (https://www.podium.co.jp/lineup/12779); Podium Frog Track 67 (https://www.podium.co.jp/lineup/12782); Podium Frog Track 70 (https://www.podium.co.jp/lineup/12783). Actual saved sources retrieved and read 27 October 2026. Distributor specifications can change; no model year is inferred.
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