Ben Haywards (Catz)- About £10 more expensive than the market
University Cycles (Victoria Avenue)- no idea, seems to be full of sit-up-and-beg new shiny bikes for newcomers to Cambridge
Light Blue Cycle Centre- Nice, friendly staff, good selection of bits, not had repairs yet.
New Cycle Shop on Bridge Street- it's new, no idea
Cycle shops of Mill Road- Loads! Cycle King, another new bike shop, and at least one or two others. I think Mike's Bikes is closed; most are on The Wrong Side Of The Tracks (over the bridge)
Cycle shop on St. Andrew's Road (Opposite the Lloyds TSB on Lensfield Road junction)- new bikes, bits, don't seem to do servicing.
Cambridge Bike Doctor- widebeam boat, by Jesus Green swimming pool- A nice guy, reasonable prices- will come to you!
Cambridge Station Cycles- reasonable, but seem to do most business in hiring bikes and selling special offer deals to new students.
Market- DON'T. They've tried to rip me off, twice- quoting one price (£20), then trying to charge £30. Luckily both times I had them write down their initial price... £34 odd quid for a service, including parts.
Bike Doctor, downstairs in car park by the Maypole- BRILLIANT- the best I've found yet. A wonderful Irish dude who charges VERY reasonable prices.
Outspoken cycle couriers are about to go into the bike maintenance business too. They're also good- but then, several friends work for them, so I would say that!