A DIY kit containing everything you need to perform the shock swap with your own core. This will include a correctly sized spring rated for your weight, a threaded preload adjuster, a spring shim, 12mm to 10mm bushings for the bottom eye of the shock, and two stainless steel bushings for the sides of the bottom of the shock to take up the difference in size of the bottom of the R6 shock vs the width of the OEM shock. You will need to supply your own shock core, and be capable of disassembly of the shock / removing the old spring, and fitting the new parts to your shock core.

Note: KTM changed the exhaust after the initial release of the bike. Later model years will need to fit a mid-pipe / decat to allow access for the nitrogen reserve on the shock, but otherwise it should still fit.
Estimated Product Weight: 7.90lbs / 3.591kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

This is JUST two thin stainless steel bushings for the side of the bottom of the shock. The R6 shock width is ~1.5mm narrower than the OEM shock, which then requires two bushings on the side to them take up this missing width. The bushings have been turned on a lathe here at Formula390 from billet stainless steel bar stock, with a 10mm clearance hole on the ID, and a width for the two washers to take up this missing space so your R6 shock once fitted is not then loose on the bottom bolt which mates the shock to the swingarm.

NOTE: If you are ordering ONLY the side bushings then you may ignore the quoted shipping amount. Shipping is $3.65, and any excess shipping amount will be refunded.
Estimated Product Weight: 0.10lbs / 0.045kg
Estimated Product Box Weight: 0.10lbs / 0.045kg

These are the 12mm to 10mm reduction bushing necessary to fit bottom shock mount for the R6 shock to the Duke 390 Frame. The bushing are PTFE-lined bronze bearings with steel shell and have a slit running along the length of the bearing that allows you to slip fit them into the bottom mount of the R6 shock. A width of 30mm is necessary, so comes with two 15mm wide bushings for total 30mm.
Estimated Product Weight: 0.10lbs / 0.045kg
Estimated Product Box Weight: 0.10lbs / 0.045kg

This is for labor involved in installing the DIY kit onto your shock core. To coordinate, you can email with Matt@Formula390.com to arrange shipping your core here.
Estimated Product Weight: 0.01lbs / 0.005kg
Estimated Product Box Weight: 0.01lbs / 0.005kg

Front Springs for your 2013-2016 Duke are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

Note: This ONLY fits 2013-2016 Dukes. In 2017 KTM changed the fork design to a traditional fork design which needs different springs. These can be ordered from an Ohlins dealership as they are the only ones who make springs that will fit the 17+ Dukes..

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

Front Springs for your 2013-2016 Duke are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

Note: This ONLY fits 2013-2016 Dukes. In 2017 KTM changed the fork design to a traditional fork design which needs different springs. These can be ordered from an Ohlins dealership as they are the only ones who make springs that will fit the 17+ Dukes..

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

Front Springs for your 2013-2016 Duke are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

Note: This ONLY fits 2013-2016 Dukes. In 2017 KTM changed the fork design to a traditional fork design which needs different springs. These can be ordered from an Ohlins dealership as they are the only ones who make springs that will fit the 17+ Dukes..

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

Front Springs for your 2013-2016 Duke are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

Note: This ONLY fits 2013-2016 Dukes. In 2017 KTM changed the fork design to a traditional fork design which needs different springs. These can be ordered from an Ohlins dealership as they are the only ones who make springs that will fit the 17+ Dukes..

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

Front Springs for your 2013-2016 Duke are a necessity after you sort out the rear shock. These are RaceTech springs and are available in spring weights from 0.8 to 1.2. If you don't know what size spring you need, send us your weight in and out of gear when you place your order so we can size the springs for your weight correctly.

NOTE: To disassemble the fork lowers, a "Pin Wrench" is a required specialty tool. We offer them for sale for those who may not have one, as a convenience to owners who will be doing the suspension upgrade themselves. The other specialty tool needed is a propane torch, available at any hardware store, which is used to break the Loctite (Red which needs to hit 500F / 250C to release) holding the fork legs lower cap in pace as well.

Note: This ONLY fits 2013-2016 Dukes. In 2017 KTM changed the fork design to a traditional fork design which needs different springs. These can be ordered from an Ohlins dealership as they are the only ones who make springs that will fit the 17+ Dukes..

Spring Suggestions
Weight in Gear	Street	Race
140#	0.85	0.90
160#	0.90	1.00
180#	1.00	1.10
200#	1.10	1.20
225#	1.20	1.20

Estimated Product Weight: 4.00lbs / 1.818kg
Estimated Product Box Weight: 2.00lbs / 0.909kg

A Pin Wrench is necessary to disassemble the forks. This specialty tool is available here as a convenience for riders who don't already have one.
Estimated Product Weight: 0.50lbs / 0.227kg
Estimated Product Box Weight: 0.50lbs / 0.227kg

These Ride Height Adjusters replace the blank end caps on the stock KTM Duke 390 front suspension. These caps allow the rider to increase and decrease the ride height of the front forks allowing for quick changes without having to go to the trouble of moving the forks up and down in the clamps.

Supplied in black and clear anodised finish, these adjusters are as beautiful as they are functional.
NOTE: Does NOT fit 2017-2019+ model years.
Estimated Product Weight: 0.44lbs / 0.200kg
Estimated Product Box Weight: 1.00lbs / 0.455kg

This comprehensive kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Finally, we provide a complete set of high quality Japanese Koyo wheel bearings to replace the not so good ones supplied from the factory.

All in all, a useful and inexpensive upgrade. Now you really are ready to race!

Included in this kit are the following components:

• Bearings:
  • Front Wheel x 2
  • Rear Wheel x 2
  • Sprocket Carrier x 2
• Seals:
• Front Wheel x 2
• Rear Wheel x 2
• Spacers:
• Front Wheel: Left, Right, and Center
• Rear Wheel: Left, Right, Center, and Sprocket Carrier

Estimated Product Weight: 1.37lbs / 0.623kg
Estimated Product Box Weight: 0.50lbs / 0.227kg

This comprehensive kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Finally, we provide a complete set of high quality Japanese Koyo wheel bearings to replace the not so good ones supplied from the factory.

All in all, a useful and inexpensive upgrade. Now you really are ready to race!

Included in this kit are the following components:

• Bearings:
  • Front Wheel x 2
  • Rear Wheel x 2
  • Sprocket Carrier x 2
• Seals:
• Front Wheel x 2
• Rear Wheel x 2
• Spacers:
• Front Wheel: Left, Right, and Center
• Rear Wheel: Left, Right, Center, and Sprocket Carrier

Estimated Product Weight: 1.37lbs / 0.623kg
Estimated Product Box Weight: 0.50lbs / 0.227kg

This kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Now you really are ready to race!

Included in this kit are the following components:

• Spacers:
  • Front Wheel: Left, Right, and Center
  • Rear Wheel: Left, Right, Center, and Sprocket Carrier

Note: We also offer a similar product in orange and kits for the wheel spacers, bearing and seals
Estimated Product Weight: 0.51lbs / 0.232kg
Estimated Product Box Weight: 0.50lbs / 0.227kg

This kit is specifically designed for the KTM racer in mind. The wheel spacers have been cleverly designed to be captured in the seals (instead of being loose as they are with stock set up), enabling quick and easy wheel removal and installation; essential when every minute counts to get out in time for a session or race.

In addition, the spacers are all made out of high quality aluminium (6061-T6) instead of steel giving a useful saving of 65% in important unsprung weight.

Now you really are ready to race!

Included in this kit are the following components:

• Spacers:
  • Front Wheel: Left, Right, and Center
  • Rear Wheel: Left, Right, Center, and Sprocket Carrier

  Note: We also offer a similar product in orange and kits for the wheel spacers, bearing and seals
  Estimated Product Weight: 0.51lbs / 0.232kg
  Estimated Product Box Weight: 0.50lbs / 0.227kg