Any "real sleuths among you"? Because I'm not so sure about this one.

[vmonte]

No: HPFGUIDX 95587

Sue B wrote:
 
Makes sense to me! :-) What doesn't make sense is the notion 
that a motorbike that Sirius was riding around on would be big 
enough to fit Hagrid in the first place! I mean, we're talking here 
about a man 12 feet high, right? Around twice Sirius's height, not 
to mention bulk.
 
Anyone got any ideas or is this just something the author and/or 
editor never considered, perhaps? Easy enough to do, I suppose!

vmonte responds:

I thought the same thing you did. The only way that Sirius's bike 
would fit for Hagrid would be if the bike could somehow adjust it's 
size depending on the driver. It's a shape shifting transportation 
vehicle.  Maybe it's also the Weasley's car?! 

By the way that car is awfully sentient for a machine. 

It would be nice to see DD and Minera using their transfiguration 
skills for a change...