October 12, 201411 yr having a look on a few sites and there are 2 chains for sale. a 428 and a 520. which the best for a late 70s montesa 247 cota? cant seem to find any info on it. many thanks.
October 12, 201411 yr 520 would be best but you will need the appropriate sprockets to fit ,,ie if it has 428 on you would need to replace sprockets as well
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