The Simplicity 7100 lawn tractor/ride-on mower uses two published belt sizes: 1/2" Wide x 78" I.D. for the PTO to cutter deck belt and 1/2" Wide x 81" I.D. for the transmission belt / cutter deck belt. Match each belt to its correct position and OEM reference before ordering.
Belt replacement guide
Simplicity 7100 belt size & replacement chart
OEM references, belt positions and published dimensions for this lawn tractor / ride-on mower.
Match the belt function first, then confirm the OEM number and size.
Belt application
OEM / replacement number
Published size
Listing SKU
PTO PTO To Cutter Deck Belt
1666801
1/2" Wide x 78" I.D.
BEL6880
Transmission / motion Transmission Belt / Cutter Deck Belt
1607813, 165950
1/2" Wide x 81" I.D.
BEL6883
Application details
Which Simplicity 7100 belt do you need?
PTO To Cutter Deck Belt
Recorded OEM reference: 1666801. Published size: 1/2" Wide x 78" I.D.
Transmission Belt / Cutter Deck Belt
Recorded OEM references: 1607813, 165950. Published size: 1/2" Wide x 81" I.D.
Important: Confirm the belt position, deck size, serial range and machine configuration before ordering. Belts with the same length can use different widths or profiles.
Common questions
Simplicity 7100 belt FAQ
What belt does the Simplicity 7100 use?
The listed belt applications are PTO To Cutter Deck Belt and Transmission Belt / Cutter Deck Belt. Recorded OEM references: 1666801, 1607813, and 165950.
What are the Simplicity 7100 belt part numbers?
The recorded OEM references are 1666801, 1607813, and 165950. Match each number to the correct belt position before ordering.
What belt sizes does the Simplicity 7100 use?
PTO To Cutter Deck Belt: 1/2" Wide x 78" I.D. and Transmission Belt / Cutter Deck Belt: 1/2" Wide x 81" I.D.
Why are multiple belts listed for the Simplicity 7100?
This machine has 2 recorded belt applications. Different belts can operate the mower deck, transmission, PTO, clutch or other drive components.
Can I match the Simplicity 7100 belt by length alone?
No. Width, profile, inside or outside circumference, belt position and OEM reference can all affect fitment. Match the belt function and OEM number first, then use the dimensions as a final check.
