After the disastrous recall of every single one of its first model of derailleur (the SRAM ESP 900), SRAM boldly stuck with its dream, slightly redesigning the gear and sorting out the manufacturing process - and the 1996 SRAM ESP 9.0 and then the 1997 SRAM ESP9.0SL were the results.
The design of the 9.0SL includes all SRAM’s signature features; the one-to-one actuation, the steeply angled slant parallelogram, the lack of float in the guide pulley and the single sprung pivot design with the top pulley wheel almost concentric with the sprung pivot (all except one-to-one actuation and that 'almost' follow the basic design of the SunTour V GT).
When manufactured using ‘carbon composites’, with sealed bearing pulleys and an aluminium attachment bolt, the result was an extremely light and very capable gear. However, I personally still found it hard to believe that a plastic gear had the integrity of an aluminium design, and I found it hard to shake the unfair notion that this gear was a sophisticated toy.
I have come across 3 'standard' variants, and 2 special edition' variants, of the ESP 9.0SL. I think these can, possibly, be dated as follows:
This example is SRAM's famous 10th Anniversary ‘Betsy’ version. It is named for Betsy Ross, who supposedly sewed the first ‘Stars and Stripes’ flag for George Washington. This ‘Betsy’ is the lightest of my SRAM 9.0SL’s.
The perfect derailleur for a leisurely spin through Sadr City.