I have a 12-23 already, but i'd like a 12-25. Gear ranges are as follows -
Can i just buy the loose 25T starter cog, unpack my existing cassette, drop the 18T and simply add the 25T? Or do i also need a new non-starter 23T? Are there spacer issues, or anything else i need to worry about?
My shop - www.spinbikeshop.com
My team - www.teampanther.com
Just buy the cog and pop it on. Nothing special to worry about. I recently added a 26 to my 23, dropped the 16.