Frog Bikes Track Gearing: Why Chainring Teeth Are Only Part

Frog Bikes Track gearing cannot be established from a chainring number alone. Podium lists a different front chainring for each of the three Track models, but its specification pages do not give a rear sprocket tooth count. That missing information matters when asking a coach about a child's setup or comparing an unfamiliar used bicycle with a catalogue entry.

Frog Bikes Track gearing: Read the front figures accurately

The listed Track 58 chainring has 36 teeth, Track 67 has 40 teeth and Track 70 has 44 teeth. Each appears beside its model's crank length, but those measurements describe different things. The millimetre figure belongs to the crank arm; the tooth count belongs to the chainring that engages the chain.

The pages describe a KMC single-speed chain, with a half-inch by one-eighth-inch designation, and a Quando rear flip-flop hub. Neither entry identifies the fitted rear sprocket's tooth count. Do not fill that blank from a photograph, another retailer's mixed specification or the assumption that every bicycle left the factory identically.

Ask for the whole drivetrain record

Have the front and rear tooth counts identified on the actual bicycle. Record which rear arrangement is installed and retain the component instructions. A flip-flop description names a hub arrangement; it is not evidence that both sides are equipped alike or that the bike in front of you is configured for the planned session.

Give the coach the information that changes the answer

Include the complete tyre marking and any wheel changes in the setup discussion. The distance travelled for a pedal revolution depends on more than a front tooth count. A comparison that ignores the rear sprocket and wheel information cannot establish how two complete bicycles will relate on the track.

If the session or competition has equipment limits, obtain the organiser's current requirements and ask how the bicycle will be checked. This article gives no universal youth racing limit or rulebook interpretation. The catalogue's word “race-ready” does not establish acceptance at a named event, especially after components have been changed.

Keep replacement decisions separate from arithmetic

Even a complete set of numbers is not an installation approval. Changing a chainring or rear sprocket requires the correct parts, securing method and adjustment for the actual assembly. Ask a qualified stockist to check compatibility and the completed work. Avoid ordering a part solely because its tooth count matches a proposed target.

A useful handover note states the model, installed components, measurements, proposed use and the question being asked. Keep the mechanic's findings with that note. The next parent or coach can then distinguish a verified setup from an old shopping description instead of repeating the same incomplete calculation.

The Frog Bikes topic offers other component guides, while the Frog Bikes introduction places the Track family within the range. For Frog Bikes Track gearing, the practical result is a complete inspected drivetrain record and a session-specific decision.

FAQ

Does a 36T chainring establish Track 58's complete gearing?

No. The rear sprocket and actual wheel information are also needed for a meaningful whole-bike comparison.

Does Podium publish the rear tooth count in these entries?

No rear sprocket tooth count appears in the three specification pages used here.

Does a matching tooth count prove a replacement fits?

No. The actual interfaces, retention and complete installation need a separate compatibility check.

Sources

These three product entries give the front tooth counts, single-speed chain description and flip-flop hub. They omit a rear sprocket count, so no complete gear ratio or event-compliance calculation is claimed. 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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