Progressive Suspension springs offer a soft initial spring rate for a plush ride. Progressively wound design provides increased resistance to bottoming as spring compresses.
Improve handling while retaining OEM geometry.
1973-87 Sportster - 35mm
1988-2003 Sportster - 39mm - Except 1992-2003 Hugger
2004-15 Sportster - 39mm
2016-2022 Sportster 39mm - Except 1200X & 1200S
2016 -2022 Sportster 48 1200X & 1200S - 43mm
