Join Date: May 2008
Location: The Mangroves, UK
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" Anyone have any thoughts on whether it makes sense to do so?"
Waddya mean, your Jack isn't very fast? Acceleration? Top speed?
Upgraditis is expensive - the Jack's gearing can be tweaked, possibly a larger chainring, which may need a longer chain and new front derailleur for more top speed.
I haven't compared the Matrix gearing, but the 2007 bike spins out around 28 mph with me on it. Though billed as an urban warrior the bike is a 24 speed folding offroadie with OEM smooth tires. Has the same frame as the Jack - changed on the 2008 models
The rims, disk brakes etc are all medium-to-good spec on the Matrix, but aren't going to make the bike faster. The heavier weight of the forks won't help either.
If you post the gear info for both bikes here, somebody whizzo will give you a bit more info. A chainring change might give more top speed, together with a close look at the overall gear ratios - but you only got seven to play with.
For comfort though, the Matrix is pretty good, but you'll need a suspension seatpost or a gel saddle to finish it off. The Suntour Nex 4600 forks are good performers on potholed tarmac, but need an oil change every 50 hours, and a dealer service every 100.
Another option is for your LBS to swap out the Jack fork for a sus unit, but this won't increase top speed. It might make you ride a bit faster though, as you won't slow down so much for bad surfaces.
Cheapest upgrade is a susp-seatpost. 27.2mm x 350 mm I believe.
Last edited by snafu21; 07-10-08 at 02:00 PM.