Barnett, kapitel 26 - Chains. Sista sidan Eight- And Nine-speed Compability;
COMPABILITY
The nine-speed chain is still close enough to the dimensions of other derailleur chains that it fits eight-speed and lesser configurations. However, the lesser spacing between cogs on nine-speed cog sets makes it impossible to use anything other than a nine-speed chain on nine-speed cog sets.
Shimano nine-speed drive trains have other differences in addition to the chain and spacing between cogs. Spacing between chainrings has been reduced, and the widht of the front derailleur cage has been reduced as well. As a result, chains that are not the nine-speed dimension are not compatible with chainrings and front derailleurs that are designed as nine-speed configurations.
The nine-speed chain can be used with other than nine-speed chainrings and front derailleurs. Due to deisgn differences more than dimension differences, performance might be slightly compromised, but this combination will be functional.
At the time of writing, Shimano nine-speed chains have a different design from their previous chains, not just different dimensions. Most current Shimano chains that are not nine-speed type are the IG design. This design has side-plate shaping that is designed to optomize shifting from smaller to larger-diameter gears and additional shaping that is designed to optomize shifting from larger to smaller-diameter gears. The nine-speed chain is an HG design, which only has the shaping designed to optomize shifting from smaller to larger-diameter gears. Consequently, the nine-speed chain, whether used on a nine-speed drive train or a drive train that is other than nine-speed, will not shift as well from larger to smaller-diameter gears (particularly under high load).
Sammanfattningsvis; Det går att använda en HG kedja avsedd för niodelat på alla äldre växelsystem. Det kan funka lite sämre men ändå funka godtagbart bra. Man kan inte använda en kedja för åttadelat på niodelat pga att det är smalare mellan dreven i kassetten samt mellan klingorna, vidare är framväxeln något smalare. Dessutom växlar HG-kedjan sämre från ett större till ett mindre drev oavsett om det är åtta- eller niodelat den sitter på (speciellt under belastning).
