Angle slackening headsets (for IS-type integrated bearings). ANYBODY?

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Angle slackening headsets (for IS-type integrated bearings). ANYBODY?
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flag jgoldfield
Posted: Aug 27, 2021 at 11:02 Quote
Yeah, I was giving some thought to that today. I feel like I could probably design some pretty simple countersunk bushings that drop into the head tube to reduce the diameter down to an IS41. If any Stumpy owners want to go in on a Protolabs order, let me know...


Just got this response from 9point8 today; sounds like it's designed and in the works, but they're dealing with supply chain/manufacturing issues. No commit date though...

"YES, we are bringing out a new version for the IS42 crowd. It has just been getting hit with production delays as a result of the global situation. I’m hoping there are no more delays and we will be able to share a release date soon.
Once we have a confirmed release date we will open up pre-orders for the new versions of the Slack-R!"
flag englertracing
O+
Posted: Aug 27, 2021 at 11:44 Quote
Damn I messed my post up

Barstock* not barstool

And larger OD not ID
flag thelittle
Posted: Nov 8, 2021 at 10:48 Quote
9 point 8 finally released IS42 anglesets. check their site.
flag jgoldfield
Posted: Nov 8, 2021 at 12:54 Quote
They're listed on the site, but not actually available to order yet. Response from 9point8 today:


We will be releasing a new version that works with IS42 uppers for most popular brands, and another version that works for Specialized IS42 and it's deeper bearing seats. (Some Specialized have Standard depth IS42 so if you have a Specialized, you need to determine which style you have on your bike. Most likely will need to remove the stem and physically investigate.)

We are hoping to see it become available very very soon. As you see the website is being updated to allow the new variations.
flag melanthius
O+
Posted: Nov 8, 2021 at 13:18 Quote
I see them listed, but none of the 42 upper cups seem to be in stock.
flag melanthius
O+
Posted: Jan 4, 2022 at 12:53 Quote
I ended up getting one of the 9point8 IS42 headsets (1.7 degree) for my Production Privee Shan. It's a very well-made piece but unfortunately didn't work as designed with my frame. The hourglass head tube doesn't maintain anywhere close to a large enough internal diameter to accommodate the tensioning system. In fact it even got narrow too quickly to allow the lower cup to seat fully!

Rather than give up I decided to run an experiment. I shortened the inside-the-headtube leg of the lower cup enough that it would seat properly at the bearing seat and installed the whole thing without the tensioner. So, the headset preload and the stem clamp are the only things holding the whole stack together. I used friction paste between the frame and SlackR cups, and greased the bearings.

I started by just sitting on the bike and everything seemed fine. I rode around the driveway and everything was fine. I bounced the fork and heard one click. I checked for headset play and found none, loosened the stem clamp and tightened the bearing preload out of an abundance of caution and retightened the stem clamp. Bounced around again and had no more sounds.

Took it on a trail ride and everything sounded and felt like a completely normal headset. Sessioned a jump line with a couple drops and nothing made noises or loosened up over an hour or so. At this point I trust it.

Not sure I would recommend anyone else run it like this (and I certainly didn't as 9point8 if they would recommend it) but I'm going to ride it until something becomes a problem. If this didn't work I was going to replace the frame becasue the stock 66 degree HTA at full height becomes 68 after sagging a 150mm fork and the bike handled like an XC instead of the aggressive hardtail it's supposed to be. With the SlackR the sagged HTA is about 66.3 and the bike handles so much better.

The offending headtube:

photo
flag jgoldfield
Posted: Jan 13, 2022 at 10:57 Quote
Nice! Glad you were able to make it work; sounds a little sketchy (I'd be a little worried about the cups rotating and/or risk of over torquing the star nut in order to provide enough tension to hold everything together) but hey if it seems to work then go for it.

Installed a 1.6 degree Foxtrot on my Camber and it's been a huge improvement; probably the best upgrade I've ever bought. Brought the head angle from 68 to 66.4, which feels like a sweet spot for that bike. Handling is just as light and nimble as before (that's what I love about the bike), but overall just less twitchy and way more stable at speed and on steeps. It used to be kind of nerve wracking to keep the front end under control in th gnar, but now it feels natural.
flag thelittle
Posted: Jun 9, 2023 at 18:44 Quote
jgoldfield wrote:
Nice! Glad you were able to make it work; sounds a little sketchy (I'd be a little worried about the cups rotating and/or risk of over torquing the star nut in order to provide enough tension to hold everything together) but hey if it seems to work then go for it.

Installed a 1.6 degree Foxtrot on my Camber and it's been a huge improvement; probably the best upgrade I've ever bought. Brought the head angle from 68 to 66.4, which feels like a sweet spot for that bike. Handling is just as light and nimble as before (that's what I love about the bike), but overall just less twitchy and way more stable at speed and on steeps. It used to be kind of nerve wracking to keep the front end under control in th gnar, but now it feels natural.

hey what is exactly your Camber model and wich headset model you bought?

I have a 2016/17 aluminium camber and dont know exaclty wich model to buy. Even email 9point8 asking but they couldnt say for sure by model and year.
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