Don't think there is a Shimano or SRAM one - it just extends the distance of the hanger therefore moving the top jockey wheel further away from the cassette. Run mine for over a thousand miles with no issues
Looks great. Did you set it up yourself?
The only issue outstanding then is chain wrap.
Says it varies depending on chain stay length and chainset.
Is there an online calculator??
Don't think there is a Shimano or SRAM one - it just extends the distance of the hanger therefore moving the top jockey wheel further away from the cassette. Run mine for over a thousand miles with no issues