Renthal 420-57P 189U-420-57GRSI Rear Grooved Sprocket, 57 Tooth, Silver

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 is a CNC-machined rear sprocket made from 7075 T6 aluminum. Its lightweight aluminum construction is designed to reduce rotating mass compared with steel while maintaining the strength required for powersports applications. The sprocket features precision manufacturing for accurate fitment, concentricity and load dispersion, along with tooth profiling intended to support efficient power transfer.

This silver, 57-tooth rear grooved sprocket fits select Honda CR80R and CRF150R models. Listed fitment includes the 1986–1988 Honda CR80R, 2007–2009 Honda CRF150R, and 2012–2015 Honda CRF150R. Verify the model and year before ordering. The manufacturer part number is 189U-420-57GRSI, and the vendor part number is 420-57P.

Features:

• Brand: Renthal
• Construction: CNC-machined 7075 T6 aluminum
• Sprocket Type: UltraLight rear grooved chainwheel
• Tooth Count: 57 teeth
• Finish: Silver
• Fitment: 1986–1988 Honda CR80R
• Fitment: 2007–2009 Honda CRF150R
• Fitment: 2012–2015 Honda CRF150R
• Manufacturer Part Number: 189U-420-57GRSI
• Vendor Part Number: 420-57P

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