The Renthal 189U-420-51GRSI UltraLight Rear Chainwheel is a CNC-machined aluminum sprocket designed for powersports applications. Manufactured from 7075 T6 aluminum, it is engineered for precise fitment, concentricity, and load dispersion. Its grooved design and silver finish provide a functional replacement option for compatible Honda motorcycles.
Computer engineering and testing support accurate manufacturing, while the tooth profile is designed to promote effective power transfer. Renthal states that this aluminum rear sprocket is 66% lighter than steel, helping reduce unsprung weight compared with a steel sprocket. A hardwearing surface treatment and high-strength base material support durability in demanding riding conditions.
This chainwheel fits 2007, 2008, 2009, and 2012–2015 Honda CRF150R models, as well as 1986–1988 Honda CR80R models. Manufacturer part number: 189U-420-51GRSI. Vendor part number: 189U-420-51GRSI.
Features:
- Brand: Renthal
- Model: 420-51P
- Part Number: 189U-420-51GRSI
- Construction: CNC machined from 7075 T6 aluminum
- Weight Reduction: Renthal states the sprocket is 66% lighter than steel
- Design: Grooved rear chainwheel with a silver finish
- Tooth Profile: Designed to provide effective power transfer
- Manufacturing: Computer engineered and tested for precise fitment, concentricity, and load dispersion
- Fitment: 2007, 2008, 2009, and 2012–2015 Honda CRF150R; 1986–1988 Honda CR80R
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
Fitment:
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