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Slack-R Parts

Upper Cup Min L Max L Lower Cup Min L Max L Tensioner L Kit Weight (g) Kit
0000-1343 22 26 0000-1349 25 29 0000-1345 43 112 Alpha
0000-1343 22 26 0000-1349 25 29 0000-1346 53 118 Bravo
0000-1343 22 26 0000-1349 25 29 0000-1347 63 125 Charlie
0000-1343 22 26 0000-1349 25 29 0000-1348 73 134 Delta
0000-1343 22 26 0000-1350 32 36 0000-1345 43 117 Echo
0000-1343 22 26 0000-1350 32 36 0000-1346 53 123 Foxtrot
0000-1343 22 26 0000-1350 32 36 0000-1347 63 130 Golf
0000-1343 22 26 0000-1350 32 36 0000-1348 73 139 Hotel
0000-1344 42 46 0000-1349 25 29 0000-1345 43 119 India
0000-1344 42 46 0000-1349 25 29 0000-1346 53 125 Juliet
0000-1344 42 46 0000-1349 25 29 0000-1347 63 132 Kilo
0000-1344 42 46 0000-1349 25 29 0000-1348 73 141 Lima
0000-1344 42 46 0000-1350 32 36 0000-1345 43 124 Mike
0000-1344 42 46 0000-1350 32 36 0000-1346 53 130 November
0000-1344 42 46 0000-1350 32 36 0000-1347 63 137 Oscar
0000-1344 42 46 0000-1350 32 36 0000-1348 73 146 Papa



The 9point8™ Slack-R™ kit changes the head tube angle on bikes with IS headsets. (IS41/28.6 upper bearing and IS52/40 lower bearing only.)


Have you found a Kit that fits your bike?There are convenient kits that group the parts you need here. But if you want to buy individual Slack-R parts, you are in the right place! You need three individual parts to adapt your bike (Upper Cup, Tensioner, and Lower Cup); use our kit selector on the kit page to get the right combo.


Confirm the three checks below and complete the drop down menus to see what Slack-R kits are available for you.

1. Confirm your headset is the IS Standard. If you are not sure,read this article on Headset Identification by the experts at Park Tools.


2. Confirm you have enough steer tube length to install a Slack-R If measurements A + B are greater than 20mm there is enough steer tube to install a Slack-R

3. Measure or look-up your bike's head tube length (HTL). Bicycle manufacturers often list your bike's HTL in geometry charts on their websites. You can also measure this yourself as shown below.


What does installing a Slack-R do to your bikes geometry?

Click HERE to take a deeper look.


Does your bike have a Trek Knock Block headset? The Stop Chip must be removed from all Trek Knock Block headsets before installing a Slack-R. Read more here.

Slack-R Parts

  • Product Code: Slack-R Parts
  • Availability: In Stock
USD$0.00

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