Changing the size of the rear cog or chain ring may solve the tension issues (maybe with some trial and error) looks like you could do with something a bit bigger on the back anyway, is it 52:16?
@Aches started
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Changing the size of the rear cog or chain ring may solve the tension issues (maybe with some trial and error) looks like you could do with something a bit bigger on the back anyway, is it 52:16?