I own a roadrat and my flatmate owns a pompetamine. If I was to buy now I’d get a pompetamine. (I got mine a few years ago – before the pomp came out. This is due to a few minor issues with my rat, but don’t get me wrong it’s a great bike
Pomp have a standard road headangle = quicker handling than the rat.
Pomp is quite a bit stiffer than the rat – the rat being as flexy as a very flexy thing. Not so good if you plan to do any regular touring on it.
Running singlespeed and discs is easier on the rat
Running discs and a rack is easier on the pomp
The CS mounted disc arrangement on the pomp means you need to slide the disc caliper backwards and forwards to account for the wheel moving backwards and forwards in the dropouts when tensioning your chain.
The SS mounted disc arrangement on the rat means you need to buy a disc specific rack for the rear to clear the caliper, but if you do so it causes no problems. It does however look like an ugly cludge.
Both are a pain if you’re running full length mudguards and singlespeed. (the rack mount gets in the way of your spanner loosening your wheel bolts (not a problem if you’re running more modern kit with allen keys, but a pain if you’re using a bolted hub). Also if you change your chain tension or sprocket sizes you need to re-adjust your rack to the new wheel position.
The rat has closed cable guides, of which the centre one on the toptube is daftly placed (I kept cracking my knees off the thing) whereas the pomp uses ziptie mounts. Personally I change kit a lot and would prefer ziptie mounts rather than having fully closed guides.
The rat is more versatile than the pomp, but suffers from being jack of all trades master of none.
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As for how much I know the bike, I’ve owned my rat for 2 years, using it as a longdistance touring bike 3,500miles of the silk road. used it as a workbike for 6 months (I’m a courier) and currently use it to bike-polo on.
The pomp as I have said is only new (my flatmates, but it is really goddamn pretty)