Hi anybody know what tool beside chain whip I need to change a rear cog on Salsa El Mariachi SS. It’s not the usual shimano lock nut type thingy
Thanks

Pic

image by hlpjones, on Flickr

Needs a C spanner to undo the lockring.

C spanner or you can tap it off with a thick flat headed screwdriver and hammer but that is more awkward.

Thank you very much my LBS tightened it up for me once when it came loose once and I couldn’t for the life of me remember what it was called
Cheers

http://pedros.com/products/toolsfor-the-ride/trixie-black/

And a chain whip

http://www.ebay.co.uk/itm/170797722965

I use a tool like that for my El Mar.