sag of transmission chain

Tension regulation is indeed related to the length of the transmission chain, but they are two different concepts.A longish transmission chain doesn’t mean they lack of tension, but people are usually don’t want to see the sag of the chain. Actually, the tension will be reasonable if the chain can engage with the sprocket’s teeth well and can afford the load successfully.According to the above drawing, even 80 mm difference in sag will only reduce 1.5 teeth’engagement, so the length of chain is not key factor of tension.However, overlong chain will impact on the the engagement and brings insufficient wrapping [...]