The Simplicity LTH38/125 lawn tractor/ride-on mower uses two published belt sizes: 1/2" Wide x 88" I.D. for the 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 LTH38/125 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
Mower deck Cutter Deck Belt
1666698
1/2" Wide x 88" I.D.
BEL6890
Transmission / motion Transmission Belt / Cutter Deck Belt
1607813, 165950
1/2" Wide x 81" I.D.
BEL6883
Application details
Which Simplicity LTH38/125 belt do you need?
Cutter Deck Belt
Recorded OEM reference: 1666698. Published size: 1/2" Wide x 88" 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 LTH38/125 belt FAQ
What belt does the Simplicity LTH38/125 use?
The listed belt applications are Cutter Deck Belt and Transmission Belt / Cutter Deck Belt. Recorded OEM references: 1666698, 1607813, and 165950.
What are the Simplicity LTH38/125 belt part numbers?
The recorded OEM references are 1666698, 1607813, and 165950. Match each number to the correct belt position before ordering.
What belt sizes does the Simplicity LTH38/125 use?
Cutter Deck Belt: 1/2" Wide x 88" I.D. and Transmission Belt / Cutter Deck Belt: 1/2" Wide x 81" I.D.
Why are multiple belts listed for the Simplicity LTH38/125?
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 LTH38/125 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.
