What does 0.5% and 0.75% stretch mean?

A new chain has a fixed link pitch of 12.7mm over 12 links spanning 152.4mm. At 0.5% stretch that span grows by ~0.75mm; at 0.75% by ~1.1mm. The indicator pin drops in at those exact points — no measurement needed.

Can I use this on my mountain bike chain?

Yes — it works on MTB chains from 6-speed to 12-speed, including narrow 11 and 12-speed MTB chains.

Topeak

Topeak Chain Hook & Wear Indicator

Name: Topeak Chain Hook & Wear Indicator
Brand: Topeak
SKU: TPS-SP09
Price: 699.00 INR
Availability: InStock
Author: InstaSport Editorial

₹699.00

Description

Integrated chain hook holds links during assembly and chain wear indicator provides precise chain measurement for maintenance. SPECIFICATIONS TOOL MATERIAL Hardened steel SIZE 10.9 x 2.2 x 1.8 cm / 4.3” x 0.9” x 0.7” WEIGHT 9.6 g / 0.34 oz Choose your language to download CHAIN HOOK & WEAR INDIC