Equivalent to a 38/54/68T triple crankset.
Recommended for speed pedelecs (e.g. 45km/h or 28mph ebikes).
38T chainring is replaceable in case of wear.
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Sheldon Brown’s calculator is probably the best tool you can find online to analyze bicycle gear ratios and find out what could work best for you!
Is it possible to mount something between 28T and 38T?
The short answer is – no.
Is it possible to mount something larger than 38T?
The short answer is – yes.
If you choose a 38T chainring as your option, you will get a GTRO with a 130BCD adapter and a 38T chainring installed on it. If you wish, you can take it off and put any larger chainring compatible with a 130BCD standard. However, as far as we know, even speed pedelecs owners rarely use GTRO with anything larger than 38T. On a third gear, it is equivalent to a 68T chainring!