Slack-R Tensioner 53mm

Name: Slack-R Tensioner 53mm
Brand: 9point8
SKU: 0000-1346
Price: 40.0 USD
Availability: InStock

0000-1346

$40.00 USD

Shipping calculated at checkout.

Select Compatible Slack-R Kit

Bravo

Foxtrot

Juliet

November

Quantity

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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.)

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 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.

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.

**Important Compatibility Information**

**MUST READ**

Slack-R is now compatible with MOST Tapered IS headsets. There are 3 different styles of upper cups now to go along with the IS52 lowers. IS41, IS42, and IS42S.

IS41/IS52 will fit a number of bikes from manufacturers such as Yeti, Santa Cruz, and Trek (eliminates the need for a Knock Block in most cases). Cube is an exception as they use a deeper upper bearing seat and the Slack-R IS41 will not sit properly in the Cube frames.

IS42/IS52 will fit many bikes from Cannondale, Norco, Marin, Orbea, GT, Revel, Scott and many more including some Specialized with a standard depth IS42/IS52 headset. Standard bearing seat depth is 3mm

IS42S/IS52 will fit Specialized bikes that have the 6.8mm deep upper bearing seat. (some Specialized bearings sit deeper than the standard IS42 geometry so they require their own specific top cup to insure proper fitment)

Headset types do vary across the same manufacturer, make sure you are sure what kind of headset you have. (IS/EC/ZS or hybrids of these)

Some IS bearing seats in the frames have a smaller bearing seat inside diameter than others so in some cases a bit of sanding will be required to fit in the 34.5mm upper sleeve and 44.5mm lower sleeve. In most cases the frame allow the kits to drop right in but in some cases opening up the upper and/or lower bearing seat inside diameter(s) will be required so double check your frame clearance prior to ordering if unsure.

Contact support@9point8.ca if you are unsure about your application prior to ordering.

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.

For your HTL and desired Angle Change, look up the Kit you need, and the Upper Cup, Tensioner, and Lower Cup part numbers you need.

Slack-R IS Kit Reference Chart

Kit	HTL (Target middle-of-range)	Nominal Angle (Deg.)	Upper Cup	Upper Cup Length (mm)	Lower Cup	Lower Cup Length (mm)	Tensioner	Tensioner Length (mm)	Added Stack (mm)
Alpha IS41	90-98	1.5	0000-1343	22-26	0000-1349	25-29	0000-1345	43	20
Alpha IS42	90-98	1.5	0000-1371	22-26	0000-1349	25-29	0000-1345	43	20
Alpha IS42S	90-98	1.5	0000-1373	22-26	0000-1349	25-29	0000-1345	43	25
Bravo IS41	100-108	1.4	0000-1343	22-26	0000-1349	25-29	0000-1346	53	20
Bravo IS42	100-108	1.4	0000-1371	22-26	0000-1349	25-29	0000-1346	53	20
Bravo IS42S	100-108	1.4	0000-1373	22-26	0000-1349	25-29	0000-1346	53	25
Charlie IS41	110-118	1.3	0000-1343	22-26	0000-1349	25-29	0000-1347	63	20
Charlie IS42	110-118	1.3	0000-1371	22-26	0000-1349	25-29	0000-1347	63	20
Charlie IS42S	110-118	1.3	0000-1373	22-26	0000-1349	25-29	0000-1347	63	25
Delta IS41	120-128	1.2	0000-1343	22-26	0000-1349	25-29	0000-1348	73	20
Delta IS42	120-128	1.2	0000-1371	22-26	0000-1349	25-29	0000-1348	73	20
Delta IS42S	120-128	1.2	0000-1373	22-26	0000-1349	25-29	0000-1348	73	25
Echo IS41	97-105	1.7	0000-1343	22-26	0000-1350	32-36	0000-1345	43	20
Echo IS42	97-105	1.7	0000-1371	22-26	0000-1350	32-36	0000-1345	43	20
Echo IS42S	97-105	1.7	0000-1373	22-26	0000-1350	32-36	0000-1345	43	25
Foxtrot IS41	107-115	1.6	0000-1343	22-26	0000-1350	32-36	0000-1346	53	20
Foxtrot IS42	107-115	1.6	0000-1371	22-26	0000-1350	32-36	0000-1346	53	20
Foxtrot IS42S	107-115	1.6	0000-1373	22-26	0000-1350	32-36	0000-1346	53	25
Golf IS41	117-125	1.5	0000-1343	22-26	0000-1350	32-36	0000-1347	63	20
Golf IS42	117-125	1.5	0000-1371	22-26	0000-1350	32-36	0000-1347	63	20
Golf IS42S	117-125	1.5	0000-1373	22-26	0000-1350	32-36	0000-1347	63	25
Hotel IS41	127-135	1.4	0000-1343	22-26	0000-1350	32-36	0000-1348	73	20
Hotel IS42	127-135	1.4	0000-1371	22-26	0000-1350	32-36	0000-1348	73	20
Hotel IS42S	127-135	1.4	0000-1373	22-26	0000-1350	32-36	0000-1348	73	25
India IS41	110-118	1.5	0000-1344	42-46	0000-1349	25-29	0000-1345	43	20
India IS42	110-118	1.5	0000-1372	42-46	0000-1349	25-29	0000-1345	43	20
India IS42S	110-118	1.5	0000-1374	42-46	0000-1349	25-29	0000-1345	43	25
Juliet IS41	120-128	1.4	0000-1344	42-46	0000-1349	25-29	0000-1346	53	20
Juliet IS42	120-128	1.4	0000-1372	42-46	0000-1349	25-29	0000-1346	53	20
Juliet IS42S	120-128	1.4	0000-1374	42-46	0000-1349	25-29	0000-1346	53	25
Kilo IS41	130-138	1.4	0000-1344	42-46	0000-1349	25-29	0000-1347	63	20
Kilo IS42	130-138	1.4	0000-1372	42-46	0000-1349	25-29	0000-1347	63	20
Kilo IS42S	130-138	1.4	0000-1374	42-46	0000-1349	25-29	0000-1347	63	25
Lima IS41	140-148	1.3	0000-1344	42-46	0000-1349	25-29	0000-1348	73	20
Lima IS42	140-148	1.3	0000-1372	42-46	0000-1349	25-29	0000-1348	73	20
Lima IS42S	140-148	1.3	0000-1374	42-46	0000-1349	25-29	0000-1348	73	25
Mike IS41	117-125	1.7	0000-1344	42-46	0000-1350	32-36	0000-1345	43	20
Mike IS42	117-125	1.7	0000-1372	42-46	0000-1350	32-36	0000-1345	43	20
Mike IS42S	117-125	1.7	0000-1374	42-46	0000-1350	32-36	0000-1345	43	25
November IS41	127-135	1.6	0000-1344	42-46	0000-1350	32-36	0000-1346	53	20
November IS42	127-135	1.6	0000-1372	42-46	0000-1350	32-36	0000-1346	53	20
November IS42S	127-135	1.6	0000-1374	42-46	0000-1350	32-36	0000-1346	53	25
Oscar IS41	137-145	1.5	0000-1344	42-46	0000-1350	32-36	0000-1347	63	20
Oscar IS42	137-145	1.5	0000-1372	42-46	0000-1350	32-36	0000-1347	63	20
Oscar IS42S	137-145	1.5	0000-1374	42-46	0000-1350	32-36	0000-1347	63	25
Papa IS41	147-155	1.5	0000-1344	42-46	0000-1350	32-36	0000-1348	73	20
Papa IS42	147-155	1.5	0000-1372	42-46	0000-1350	32-36	0000-1348	73	20
Papa IS42S	147-155	1.5	0000-1374	42-46	0000-1350	32-36	0000-1348	73	25