Actuation Ratio

[atlantis]

Hi !
I own a Btwin forme 1 , the shifters are grip shifters Sram 3.0 comp and the rear derailleur is a Sram 3(1:1 actuation ration)

I plan to change the grips to trigger, following are the options :

1> Saw this deal, but the actuation ration varies in both
http://cgi.ebay.com/NEW-SRAM-TRX-7-SPD-TRIGGER-SHIFTER-X4-Rear-Derailleur-/330568388747.
Is this compatible with each other?

2. Another deal can I use these triggers with my current setup
http://www.jensonusa.com/store/product/SL400A10-Sram+Trx+Trigger+Shifter+Set.aspx

If someone could explain the actuation ratios , i would be grateful.
thks

 

[RecordAceFromNew]

You can pick from these provided they are of the same speed, not their Shimano compatible or Exact ones.

 

[Zoiders]

Quick and dirty rule with SRAM flat bar shifters.

If it has a model name that's a word it's Shimano compatible , if it has a number designation with or without the letter prefix instead it's SRAM 1:1 pull.

 

[RecordAceFromNew]

Quick and dirty rule with SRAM flat bar shifters.

If it has a model name that's a word it's Shimano compatible , if it has a number designation with or without the letter prefix instead it's SRAM 1:1 pull.

This rule stopped working when they released flat bar models with Exact actuation, which is close to, but not the same as their 1:1 models'.

 

[Zoiders]

This rule stopped working when they released flat bar models with Exact actuation, which is close to, but not the same as their 1:1 models'.

The rule still works with the MTB groupsets.

 

[RecordAceFromNew]

The rule still works with the MTB groupsets.

I can't see how can the rule works unless the 10 speed X0, X7, X9, XX somehow aren't considered MTB groupsets, or Exact actuation is somehow identical to 1:1.