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1

If the chain rings are badly worn, its almost certain the cassette (rear cogs) and chain need replacing. do not change the chain rings on their own. The chain rings on most cranks can be replaced. Some cheaper ones (mostly kids bikes) use rivets, and you need to replace the whole crank set. If possible, the easiest thing to do is replace chain rings with ...


1

If your crank arms are in good shape, you could just get the chainring(s) and not the whole crankset. You "should" also get chain and cassette as the rear cassette could be more worn than you can see and the chain will not run smoothly and could jump around on you.


1

In case of road bikes, back in 2012 (when question was asked), there was simply no option. There was some cyclocross setup but didn't really sell in this market. Road single chainring group set only available in 2015 by SRAM. I just switched to their 1x11 (48t 11-36) from 2x10 (50/36 11-26). Hardly miss the closer ratio of the 2x10 or top speed, which ...


0

I have a 3x8 converted to 1x8, and the trick is to put a 48 tooth big ring with a road cassette. That is even in gear size increases otherwise it wont work. The chainring being 48t holds the chain well as over half its diameter is biting the chain. The only time I have a problem is if the chain is worn and slack, and I do a big jump in 8. The chain has ...


4

I suspect you'll be buying a whole new crankset. You may also need to upgrade the bottom bracket as there's not much choice of upgrades if you're starting with square taper parts. My hybrid had a very similar drivetrain, including suntour cranks/chainrings which were riveted together. You've already got a fairly wide ratio cassette for an 8 speed (I run ...


3

The thicknesses of 8 and 9 speed Shimano cogs differ by 0.02mm (http://www.sheldonbrown.com/cribsheet-spacing.html). I would say that the same chainwheel is compatible with 8 and 9 speed chains.


3

The most important measurement is the bolt circle diameter or BCD. This is the spacing that the mounting bolts use. On a 3x crank there should be 2 BCDs, one for the inner 'granny' ring mounts and one for outer mount used by the middle and outer ring. There are a variety of BCDs is use (see http://www.sheldonbrown.com/cribsheet-bcd.html). The standard is 104 ...



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