Kit	HT Length	Upper Cup	Min L	Max L	Lower Cup	Min L	Max L	Tensioner	L
Alpha	90-98	0000-1343	22	26	0000-1349	25	29	0000-1345	43
Bravo	100-108	0000-1343	22	26	0000-1349	25	29	0000-1346	53
Charlie	110-118	0000-1343	22	26	0000-1349	25	29	0000-1347	63
Delta	120-128	0000-1343	22	26	0000-1349	25	29	0000-1348	73
Echo	97-105	0000-1343	22	26	0000-1350	32	36	0000-1345	43
Foxtrot	107-115	0000-1343	22	26	0000-1350	32	36	0000-1346	53
Golf	117-125	0000-1343	22	26	0000-1350	32	36	0000-1347	63
Hotel	127-135	0000-1343	22	26	0000-1350	32	36	0000-1348	73
India	110-118	0000-1344	42	46	0000-1349	25	29	0000-1345	43
Juliet	120-128	0000-1344	42	46	0000-1349	25	29	0000-1346	53
Kilo	130-138	0000-1344	42	46	0000-1349	25	29	0000-1347	63
Lima	140-148	0000-1344	42	46	0000-1349	25	29	0000-1348	73
Mike	117-125	0000-1344	42	46	0000-1350	32	36	0000-1345	43
November	127-135	0000-1344	42	46	0000-1350	32	36	0000-1346	53
Oscar	137-145	0000-1344	42	46	0000-1350	32	36	0000-1347	63
Papa	147-155	0000-1344	42	46	0000-1350	32	36	0000-1348	73

CLICK TO DOWNLOAD SLACK-R INSTRUCTIONS

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.

Want more customization? Add additional parts to your Slack-R Kit to fine tune your HTA and test the extremes. Individual parts located here.

CompatibilityThe Slack-R is compatible ONLY with bikes using the IS41/28.6 upper headset bearing.  Some frame specs are listed as IS 1 1/8" 1 1/2" but this is NOT enough information to determine compatibility, since IS 1 1/8"  1 1/2" covers bikes with an IS41 and bikes with an IS42 upper bearing.  IS42 upper bearings have an outside diameter of 41.8mm and ARE NOT COMPATIBLE with Slack-R.  Only bikes with an IS41 upper bearing, which has an outside diameter measurement of 41mm are compatible.  For example most Specialized mountain bikes use an IS42 upper bearing and are NOT compatible.  Sorry Stumpy owners...  Contact [email protected] if you are unsure.

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.