I have a terratrike path (recumbent trike) with the sturmey archer 3 spd hub, and I am wanting to change my gearing to something higher. My highest now is 55 GI with 46x22. I am wanting replace the 22t with a 18t or 19t cog. I have seen the SA replacement cogs online, but am not sure what is involed in this. Are there any special tools needed to replace the cog?
Thanks in advance.