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I brought this to my local bike shop. They were able to get the external bolt off with a larger hex wrench (the bolt is 8mm). Not sure how they got the inner bolt out--I'll edit with an update when I stop by to pick it up after the replacement part comes in tomorrow.


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Two things, if you take off the drive-side (R) of the crank and the 'axis' moves while you hold onto the chainrings, then the crankset needs replacing (or at the very least, this drive-side part). Secondly, if there is too much play in the 'axis' while it is still in the bottom bracket, then the bottom bracket cups are probably worn out and will need ...


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A bigger gear is useful only if you can actually use it. With the 42t & the smallest cog, pedaling at 90rpm, speed will be, approximately, between 24 & 26.5mph depending on the size of the cog. Can you spin the bigger gear, the 48t? You need to know the specs for the front derailleur. The maximum chain-ring size the FD can handle will need to be at ...


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No, you can't. The lowest Shimano level crankset with replacable chainrings is in the Acera group. In any case, most replacement chainrings cost about as much as a Tourney (or even Acera) crankset, so it doesn't make much sense to replace the chainrings on those anyway. As mentioned in the answer to your other question, theres a very good chance your ...


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The TX-50 is a tourney level part (bottom of the barrel). If the bike is spec'd with a Tourney derailleur, it is most likely spec'd with a crankset which does not have replaceable chainrings, and you'd need to put on a new crank. As for chainring size, I'm not sure a TX-50 can take a 48t chainring (likely not - you'd have to look at the data sheet, which I ...


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You will probably not be able to just exchange the big ring, as that will probably require a new front derailleur. There are quite some people around, complaining for too small front chainrings, when in reality the problem is their low cadence (<70). However, a 42t big chainring could indeed be a problem for road riding. I am familiar only with Schwalbe ...


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As long as your front derailleur can be adjusted vertically to accommodate the 52tooth chainring, the drivetrain should run fine. The jumps between gears is not large so shifting would likely not be a problem but this will not be the quietest of drivetrains.



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