Renthal UltraLight Rear Chainwheel REN189U-420-54GRSI for Honda CR80R and CRF150R

Renthal UltraLight Rear Chainwheels are CNC machined from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel. Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer. A combination of high strength base material, cutting edge manufacturing methods and exceptional hardwearing surface treatments its clear to see why Renthal's light weight all aluminum rear sprockets can be found on the rear wheels of many factory race team machines.

The Renthal UltraLight Rear Chainwheel, part number REN189U-420-54GRSI, is a high-performance aluminum rear sprocket designed for powersports applications. CNC machined from 7075-T6 aluminum, it delivers substantial weight savings compared with conventional steel sprockets while maintaining the strength and precision required for demanding riding conditions. Its silver finish and grooved design provide a clean, race-inspired appearance.

Renthal computer engineers and tests each chainwheel to promote accurate fitment, concentricity, and balanced load dispersion. Carefully engineered tooth profiling supports efficient power transfer and smooth chain engagement, while advanced surface treatments help improve wear resistance. The combination of lightweight construction, precise manufacturing, and durable finishing makes this Renthal sprocket a practical choice for riders seeking responsive performance without unnecessary rotating mass.

This 54-tooth, 420-pitch rear chainwheel is designed for select Honda CR80R and CRF150R models. Confirm the motorcycle year and application before installation to ensure compatibility with the existing chain, front sprocket, and final-drive setup. Fitment includes select 1986–1988 Honda CR80R models and select 2007–2015 Honda CRF150R models.

What's Included: One Renthal UltraLight rear chainwheel in silver.

Features:

• 7075-T6 aluminum construction provides a strong, lightweight alternative to steel rear sprockets.
• CNC machining supports precise fitment, concentricity, and consistent load dispersion.
• Computer-engineered tooth profile promotes efficient power transfer and smooth chain engagement.
• Durable surface treatment helps resist wear for dependable performance in demanding riding conditions.

Fitments:
1986 Honda CR80R Base
1987 Honda CR80R Base
1988 Honda CR80R Base
1989 Honda CR80R Base
1990 Honda CR80R Base
1991 Honda CR80R Base
1992 Honda CR80R Base
1993 Honda CR80R Base
1994 Honda CR80R Base
1995 Honda CR80R Base
1996 Honda CR80R Base
1996 Honda CR80RB Expert Base
1997 Honda CR80R Base
1997 Honda CR80RB Expert Base
1998 Honda CR80R Base
1998 Honda CR80RB Expert Base
1999 Honda CR80R Base
1999 Honda CR80RB Expert Base
2000 Honda CR80R Base
2000 Honda CR80RB Expert Base
2001 Honda CR80R Base
2001 Honda CR80RB Expert Base
2002 Honda CR80R Base
2002 Honda CR80RB Expert Base
2003 Honda CR85R Base
2003 Honda CR85RB Expert Base
2004 Honda CR85R Base
2004 Honda CR85RB Expert Base
2005 Honda CR85R Base
2005 Honda CR85RB Expert Base
2006 Honda CR85R Base
2006 Honda CR85RB Expert Base
2007 Honda CR85R Base
2007 Honda CR85RB Expert Base
2007 Honda CRF150R Base
2008 Honda CRF150R Base
2009 Honda CRF150R Base
2012 Honda CRF150R Base
2013 Honda CRF150R Base
2014 Honda CRF150R Base
2015 Honda CRF150R Base
2016 Honda CRF150R Base
2017 Honda CRF150R Base
2018 Honda CRF150R Base
2019 Honda CRF150R Base
2020 Honda CRF150R Base
2021 Honda CRF150R Base

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1