Know, if you need replacement cartridges and chainrings the only way is to install a new chain, to see if it skips over the teeth under load. When testing this have to do it in a few miles per hour, while riding at high speed is very dangerous rope chain brake.
If you replace the chain skip, make sure your screws on the rear derailleur B - the tension adjusted correctly. No contact with the transmission you want the biggest coke oven gas or COG positioning higher than the bottom of a large pulley wheel as close to the top of the gear. Reduce the upper pulley and a large distance between the COG will increase focus on improving participation in COG packaging chain to prevent skipping. Correct adjustment here will greatly increase your transfer and transmission of life.
If this does not cure the problem, and you do not have the cash to replace the chainrings and cassette tapes, and then put your old chain, and keep riding with it, until the transfer deteriorated to a point, you can not stand it anymore. Hope by that time, you will have enough coverage from scratch the necessary repairs.
Last but not least, lube chain! This is a simple thing you can do to prolong your life all the transmission components and has a quiet running bike. Do not group sounds like a squeaky hamster wheel bike riding guy!
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