GarageDex

Honda MSX125 (Grom 125) SP Chain Size and Sprocket Teeth

GarageDex's manufacturer-catalogue data shows the 2024 Honda MSX125 (Grom 125) SP uses a 420 chain with 15-tooth front and 38-tooth rear sprockets from the factory. (108 links)

Chain and sprocket fitment by year

YearsChainLinksFront teethRear teeth
202442010815 (JTF249)38

Part numbers in parentheses are the manufacturer's stock-gearing sprocket codes, useful for matching a replacement.

Verified fitment
Sourced from a chain and sprocket manufacturer's own application catalogue. Reviewed by the GarageDex editorial team - how we verify →

Chain and sprockets for the Honda MSX125 (Grom 125) SP

Match the pitch (420) and tooth counts in the table - chain and sprockets are a matched set, and a mismatched pitch will not fit the sprockets at all.

Chain and sprocket kit420 pitch, stock gearingShop kits Chain breaker / riveterNeeded to size and rivet a new chainShop tools Chain lubeA dry or unlubed chain wears sprockets fastShop lube

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Frequently asked

What chain size does a Honda MSX125 (Grom 125) SP use?

GarageDex's manufacturer-catalogue data shows the 2024 Honda MSX125 (Grom 125) SP uses a 420 chain with 15-tooth front and 38-tooth rear sprockets from the factory. (108 links)

What is the stock gearing on a Honda MSX125 (Grom 125) SP?

15-tooth front and 38-tooth rear from the factory, part numbers front JTF249.

What changes if I go +2 teeth on the rear sprocket?

Going up 2 teeth on the rear sprocket (or down 1-2 on the front) lowers the gearing: quicker acceleration off the line, but a lower top speed, and the chain usually needs to be 1-2 links longer to keep enough wrap on the front sprocket - a shop or the sprocket's fitment chart will confirm the exact link count for that combination. This is a generic mechanical rule, not a claim about this specific model's aftermarket options.

How many links does a Honda MSX125 (Grom 125) SP chain have?

108 links at stock length and gearing, per the manufacturer catalogue.

Same bike, other specs: Honda MSX125 Grom battery size.

Other Honda models

Honda CB250 Night HawkHonda CB650 F / FA - E,F,G,H,JHonda CB750 NighthawkHonda CB1000 RA-N (ABS)Honda CB1000 RA-P (ABS)Honda CB1000 RA-R (ABS)Honda CB1100 A-DHonda CB1100 A-E,F

Source: JT Sprockets - Online Catalogue, a chain and sprocket manufacturer's own application catalogue. Chain and sprocket sizing is factory-stock as JT publishes it - aftermarket gearing changes (see the FAQ) are not reflected here.