Alpha Slack-R Kit 1.5°
ALPHA-IS41Regular price $109.00 USD
The 9point8™ Slack-R™ kit changes the head tube angle on bikes with IS headsets. (IS41 and IS42* upper bearing and IS52 lower bearing only.)
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 below 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.