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Dramatic_Hammer-
When the bikes were deliverd they had quite a varied gear range on them. We did what we could at the time to make them all similar. Now a year has passed, chains are due to be replaced so it would make sense to change the gearing over at the same time.
Why 78 on the smallest bikes..? At the moment there are only a handful of bikes with Youth gearing. This would allow for every bike within a youth session to be equally geared.
Matt_B
There is currently a mix between 46/15 and 49/16. Both very similar gears.
However, over the next week they are being changed. With the smallest 2 sizes as a 46/16 (78") and the rest as 50/16 (84").