Hi !

I ride a Btwin forme 1
http://www.decathlon.co.uk/EN/fitness-1-45-48-69567261/

I plan to upgrade the derailleur and shifters. Since I am ordering from Jenson Usa, I had shortlisted some derailleurs and a shifter.
I would be thankful if you’ll could go through my choices and short list the compatible mech. Since i could not find any rear derailleur matching my sram3 grip shift, I have to upgrade the shifters as well.

Shifter :
http://www.jensonusa.com/store/produ...ifter+Set.aspx

Rear Derailleurs
http://www.jensonusa.com/store/produ...erailleur.aspx

http://www.jensonusa.com/store/produ...erailleur.aspx

http://www.jensonusa.com/store/produ...+Rear+Der.aspx

http://www.jensonusa.com/store/produ...erailleur.aspx

I would certainly be open to more suggestions .
Some more queries :
I wish to upgrade the front derailleur as well, what are the points one should bear in mind before purchasing ?

Your Advice
The bike is brand new , do you’ll feel that an upgrade is required. I am aware that its my choice, but the gear system provided with the bike, is really outdated. I really value your opinion and advice..

rgds