Hows these gears work?

[lazy]

Hi I was wondering if you guys can help. I cant find any instructions on how to shift gears on my viking vuelta bike.
Thanks

 

[vickster]

As explained in your other post here http://www.cyclechat.net/threads/wh...-these-and-how-they-work.137183/#post-2592147

 

[lazy]

Thanks and sorry guys for double post .I though this one didnt went through.