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276
39mm Street Tough Fork Springs by 20th Century 
Suspension. Progressively wound springs are made using 
drawn spring wire. Eliminates front end sag, reduces nose 
dive under braking and improves stability. 1988-91 Showa 
FXR.
VT No. 24-0164
VT No.  Fits
24-1561  1984-13 FXST-FLST,1993-05 FXDWG,
 
1980-13 FLH-FLT, 1978-86 FL-FXWG
24-1560  1991-92 FXD, 1993-99 FXDL-FXDS,
 
1988-94 FXR-FXLR
24-1559  1982-87 FXR-FXRS, 1983-87 FXRT, 1984-86 FX
24-1561
Fork Tube Spring 
Sets feature high 
tensile strength wire 
construction with 
ground ends. Sold 
in pairs for OEM 
replacement per the 
factory number. For 
more fork spring 
applications check 
factory parts book.
VT No.   OEM  
Year/Model 
39mm
24-0913  45376-87  1988-94 FXR-FXRS 
24-0914  45384-83  1984-90 FXRT
41mm
24-0907  46051-49A  1949-77 FL-FLH
24-0908  45837-77  1977-84 FLH, 1980-83 FLT
24-0911  46048-84  1984-99 FXST-FXSTC
24-0525  45931-00  2000-up FLST
24-0912  45853-83  1983-96 FLT 
24-0915  45931-86  1986-99 FLST
Lower Damper Tube Springs.
VT No.  OEM  
Fits
13-9258 45374-87  87-94 FXR, 91-2017 FXD, pair
13-1946 45933-86  86-17 FLST, 2000-up FXDWG
13-9258
Note: When installing these kits, you must check ground clearance and tire to 
fender clearance.
Fork Spring Kit
VT No.  Size  Fits
24-2057  39  1987-93 FXRS-SP, 1988-93 FXRT, 
 
  
1991-05 Dynaglide, not FXDWG 
24-2056  39  1987-94 FXLR, 1988-95 FXR-FXRS, 
24-2045  39  1995-05 FXD
24-2048  41  1984-up FXST-FLST-FLSTF-FXDWG,
 
 
1993-06 FXDWG,1980-13 FLT-FLHT-FLHS,    
 
 
1980-86 FXWG, 1948-84 FL
24-2040  35  1983-87 FXRT, 1982-87 FXR-FXRS, 
 
 
1985-86 FXRD, 1973-86 FX-FXE-FXS-FXSB
Progressive Suspension 
Fork Lowering Kits.
Each kit comes with 
Progressive rate fork springs 
and spacers. Each kit can be 
installed at two different lev-
els to lower fork 1” or 2”.
Fork 
Springs
20th Century Fork Spring Lowering Kits have progressively 
wound springs that resist bottoming out. Installation requires 
minor disassembly to lower the front forks 1¹⁄₄” or 2” depend-
ing on the spacer used. Kit includes springs, spacers and 
hardware. Easily converts back to stock by reinstalling stock 
fork springs. 
VT No.  Size 
Year/Model
24-1563  41 mm  1997-13 FLT
24-0160  39 mm  1987-94 FXR
24-0161  35 mm  1984-87 FX-FXR
24-1563
Monotube Fork Cartridge Kits by Progressive Suspension 
converts dual damper rod forks to high performance cartridge 
forks. Improves resistance to front brake drive, front end sta-
bility and cornering control.
VT No.  Fits
24-2102  2000-10 FXST
24-2103  2000-up FLST
24-2104  2004-10 XL
24-0160
Progressive Suspension Fork Springs 
feature high quality, high performance 
replacement fork springs eliminate front 
end sag, reduce nose dive under brak-
ing, improve cornering stability, increase 
ride comfort and allow forks to utilize full 
travel. Sold in pairs.
24-2104