They'd be as fast as a land speeder then and they go 220kph
But like I said, guard don't have bikes anymore so not present in any lists right now. Jarvis marked them up as being comparable to a RR in the original rulebook so the community has generally seen fit to use
count-as however.
If you and your opponent are cool with them as such though go for it. The lists and units are guidelines for friendly play and even the designer notes suggested that you should do whatever you want to make the game your own (play around with stats, formations, mixing units, etc). The lists are generally built for balanced tournament use and to prevent min-maxing and power gaming as much as possible. At home though go cray cray
So for zippy bikers I'd use the size as the RR formation but 35cm movement is way more beneficial to Steel Legion and guard in general than
first strike because of the ability to easily set up cross fire bonus. I'd suggest a +25 to +50 cost over RR.
Let us know how it works out!
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