Just after indexing the gears, It is important to lubricate the chain. Implement an appropriate chain lubricant and let it sit for a couple of minutes. Then, use a thoroughly clean rag to wipe off any excess lubricant, you need the lube from the chain links not on the outside. https://hectorkewht.humor-blog.com/31852243/not-known-facts-about-indexing-bike-gears