The word "rode" is a verb, the past tense of to ride, so it has no plural.
plural
There is no plural past tense of road. Road is a noun, not a verb.
One might think that 6 cannot be made plural, because it already is (plural of 1, just very specific), but if you say it like 'The group of children rode the rollercoaster in sixes' then you could argue that this is correct. So, the plural is 'sixes'. Grammatically this is wrong, but oh well.
There is no specific collective noun for bicycles, in which case a noun suitable for the situation is used, for example a rack of bicycles, a row of bicycles, a standof bicycles, etc.
i rode a bike i rode my bike this weekend
rode
Verb: to ride; simple past: rode; past participle: ridden It would NOT be correct to say "have rode", since rode is not the participle. You would either say "we rode them" or "we have ridden them" to be correct.
¨Sandals: Walked on ¨Donkeys: Rode on ¨Boats: Rode on ¨Horses: Rode on
Rode - you would say 'Bart rode his bike' or 'Lisa rode her pony'
France Rode was born in 1934.
rode, is the simple past tense of ride for example: I rode in the car the other day.
The young girl rode her pony every day.