Mr. Wendsleydale, if you really want to down gear by removing teeth from your chainring you need to make sure that you reduce the number of teeth to about 2/5ths. This will work perfectly so in order to get a 47 tooth chainring, you'd need to start with a 117.5 tooth ring in the first place.
Mr. Wendsleydale, if you really want to down gear by removing teeth from your chainring you need to make sure that you reduce the number of teeth to about 2/5ths. This will work perfectly so in order to get a 47 tooth chainring, you'd need to start with a 117.5 tooth ring in the first place.