How to slacken HTA on Niner RKT RDO?

Pampa

Well-Known Member
Team MTBNJ Halter's
My 2017 Niner RKT has a HTA of 70*, with a 120mm Fox fork (71* with a 100mm Fox fork). The trails I want to ride now have longer, more rocky/technical descents that what I was riding before and this geometry is not very confidence inspiring, especially after eating it bad enough that I cracked a helmet. Other than this problem, I like the bike's geometry, I invested quite a lot in the buildup and fine tuning it, and it's in great shape so I'd hate to have to sell it when it still has a lot of life for me.

The bike has an integrated headset (from Niner specs: 1.125" x 1.5" tapered integrated "Campy style" Cane Creek IS42/28.6 IS52/40). I saw a company that put out an adaptor for this type of headset not long ago but it's made for headsets with IS41/28.6 at the top, so it's not compatible with my frame (Slack-R). The difference between the IS42 and IS41 is 0.8mm. It's a long shot but... I'm wondering if anyone knows about a spacer 0.8mm thick that I could fit between the frame's upper "cup" and the IS41 part.

I've dig some and found put a higher profile front tire (not sure that'll do much though) and change one or both bolts on the rear shock to shorten the eye-to-eye distance of the shock. This is supposed to change the HTA by 0.5-1.5 deg on bikes that have long travel rear socks (DH/Enduro) but my RKT has a 90mm shock, so the effect would be much smaller and I'd shortening the already short travel rear suspension.

Any other ideas on how to accomplish this?
 

Jmann

Well-Known Member
Cane creek and wolf tooth both make adjustable headsets, but not in your size. I have no idea if they can be made to work with your frame. Not sure of your fork model, but you could possibly bump your fork up to 130mm. I wouldn’t mess with the shock.

I think your best bet is to get a dropper and do the best with what you have. At least you can get your weight back to avoid going otb.
 

Pampa

Well-Known Member
Team MTBNJ Halter's
New bike time is the right answer.
Yeah, I know. I might put my RKT on the market and see what I can get for it. I've been looking for a used Pivot Mach 4 SL frame. I should've pick that one (Mach 429 SL back in 2017) instead of the RKT.
 

Santapez

Well-Known Member
Team MTBNJ Halter's
32 or 34mm front fork?

If it's a 34, I'd say longer air shaft which would also give some more bottom bracket clearance assuming it's an XC bike with low clearance. I doubt a 32mm can go to 130mm.

But 100% buy a dropper first!
 

Pampa

Well-Known Member
Team MTBNJ Halter's
32 or 34mm front fork?

If it's a 34, I'd say longer air shaft which would also give some more bottom bracket clearance assuming it's an XC bike with low clearance. I doubt a 32mm can go to 130mm.

But 100% buy a dropper first!

32mm fork. The BB clearance it's not bad, at lest I haven't noticed any problems ever. The dropper can only things better but I already ride with my butt behind the saddle in tricky descents. I guess the main thing is that I'll be able to avoid getting my nuts hit with the saddle - it has happened :)
 

Pampa

Well-Known Member
Team MTBNJ Halter's
Check to see if you can get a ibis ripley demo if your leaning dwlink.
Nice bike! The rear shock cutting through the middle of the triangle kills me though :) I want this bike for a bikepacking race (Colorado Trail Race, as the TD is not happening this year) and this setup won't let me have a frame bag. It's also more trail oriented than what I'm looking for at 66.5 HTA! That's a big change from 70 deg :) I've been riding Niner bikes for years, which all have steep HTAs (70/71 for the SS Air 9 and Air 9 RDO). I was thinking about 68.5/68 would be about right but I guess I have to try and see. The 3rd bike in the mix when I decided for the RKT was a Santa Cruz Tall Boy 3 (68 deg). I'm also looking for one of those frames/bikes to try.
 

Pampa

Well-Known Member
Team MTBNJ Halter's
I sent an email to 9point8 asking for ideas to hack this and they told me they'll be releasing a version of their adjuster for IS42 in the Spring. I can wait a couple of months so we'll see. I still plan to get a dropper.
 
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