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  1. #1
    mtbr member
    Join Date
    Jun 2014

    Giant AC 1 Upgrade

    Hey guys,

    I'm new to the MTB and don't know as much as I do about other thing but I guess there is only one way to learn.

    I am looking to upgrade by Giant AC 1 which I have recently brought for 140 pounds. It was in a pretty bad shape so there is quite a lot that I need to upgrade/replace.

    I have currently replaced rear wheel to Shimano M475 Hub on Mavic XM317 Rimand brakes to Shimano Deore M615.

    I need to replace the whole drivetrain as it skips but I'm not exactly sure what to buy.

    I was looking at buying:
    Shimano SLX M665 Double Chainset

    Shimano SLX M665 Double Chainset | Chain Reaction Cycles

    Shomano XT M770 9 speed cassette

    Shimano XT M770 9 Speed MTB Cassette | Chain Reaction Cycles

    and I've already brought SRAM PC971 for now as it was on offer.

    So my questions are ....
    Are the components I want to buy good and if so is the price right?
    Does anyone know what size BB Giant AC 1 has?

    Thanks guys

  2. #2
    Fat-tired Roadie
    Reputation: AndrwSwitch's Avatar
    Join Date
    Nov 2007
    I prefer to replace my drivetrains a piece at a time and only as necessary. In your shoes, for now I'd just put on the new chain and see if that's enough. Given that it skips, I wouldn't be surprised if you need the new cassette too, but don't get ahead of yourself.

    That's probably also a more expensive cassette than you need, though I don't generally follow links and comparison shop for other people. The HG61 is already pretty nice, and the SRAM 960 or 970 is pretty good from that brand, and often cheaper.

    You probably don't need a whole new crank. The chainrings on most cranks are replaceable. See if you still have skipping or trouble with shifting with the new chain before you spend anything, then price just replacing the affected rings against replacing the whole thing.

    You probably have a 68 mm English-threaded bottom bracket. Pull out the one you've got and have a look.

    It's also kind of a waste to throw a bunch of money at a drivetrain and not take a little time to tune up what you've got and maybe replace the shift cable housings. Check out the articles on, and start there. If your shift cables are looking skanky, go to a shop and get them to sell you new housings and cables. The stuff they sell by the foot is good enough and it's important to have clean cuts at the ends of the housings. You can also use a bench grinder or milling tool to dress the ends yourself. Or a hand file, even, but that's a pretty tedious task.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

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