[dustyduke22]

2011 Niner RIP9 v2 alloy, 142 rear conversion
X-Fusion Trace fork, 130mm
Roval Fattie 27.5 wheels, 29mm internal
Fat B Nimble tires

There is about 3mm of clearance all around with FBNs. The critical fit issue was chain contact with the tire in the lowest gear. The wheel needed truing; the rub was only on part of the rotation. I was able to eliminate the rub by doing an amateur true with a tiny bias toward the non-drive side.

I was a little surprised at this issue since the hub is supposedly a 142+, which, as I understand it, should move the cassette out 2mm relative to a normal hub. I was expecting to have to monkey with it to get it to fit, but it fit this frame just fine. However, the crank is a triple (2 rings+bash), so maybe that's why there was initially chain contact.

I couldn't get tubeless to work at first, so my first ride was with tubes at 25psi. It didn't feel or perform differently to a normal 29 setup to any significant extent, so I started to wonder what the fuss was about.

After a couple days, I tried tubeless again. This time it worked. The trick is to only detach one side of the tire from the rim and lever it out so as to be able to remove the tube and insert the tubeless stem and sealant.

I rode at 20psi and could tell a difference but still wasn't blown away.

Yesterday, I climbed at this same pressure but released some air at the top. Wow, what a difference! Incredibly smooth and plush descent, great traction, and over some pretty good chunk too. When I got home I measured about 12psi. I think I'll try a couple pounds more next time for similar terrain; I was a little worried about smashing the tire all the way to the rim on some hits.

I wondered if squirm would be a problem with the 29mm rim, but I didn't notice any.

There were some unavoidable muddy spots, including some nazty grey clay, on the previous ride, but there weren't any problems with it accumulating in the tight spots.

I am definitely sold on B+!

Nice looking build

For me, the sweet spot is 15 in the rear and 11 in the front. Even on the Kona Process 111, 15psi in the back was perfect with the 29mm internal width. I am pushing the bike pretty hard, so you might even be able to get away with 14 if the trail is not rocky. Its amazing how much difference 1 psi can make in high volume tires.

 

[MondoRides]

Dude that looks amazing, how does it ride? Let us know if the 3.0's work! Thanks for posting!

Rides nice but this bike always has. The bottom bracket drop is good (no pedal strikes), no noticeable sluggishness from the added tire weight which is great considering I added about a pound to the wheels (previously on 2.25 Nobby Nics). I think I need to play around with tire pressure a little more too. I am running 17 FR/20 RR. At 200+ lbs I normally run 22 FR/25 RR to not bottom out on harder hits and think I can drop the pressure a little more with these tires.

Honestly I've been riding my Santa Cruz Solo for most of the last few months and I really should have done back-to-back rides on the Fireline before and after the swap for a better comparison but based on the initial ride I think I'm liking it.

 

[yzedf]

Has anyone done a carbon Stumpjumper hardtail yet? I've got a 2015 World Cup (10M) frame that I'm thinking of going 27+ on to get the stronger wheels as I'm 205lbs and ride in a rocky area and I'm not the smoothest guy on the trail.

I was thinking the 38mm Light Bicycle hoops looked nice, 38 outer, 31.6 inner and 32 tall.

 

[bencab]

Barney's Ride - Purple Yelli

Inspired by Dustyduke, here is my 27+ set up.

 

[shmtastic]

Just got my Speccy 2012 Camber Comp set up with WTB Trailblazer 2.8's on Blunt 35's with 14/15 DT spokes, brass nips and BHS hubs. Fits fine, no issues at all. May be able to go with a 3.0 when a suitable one comes out, willing to try for sure. Front fork is an x-fusion Slide 120, no fitment issues there either. Running 19 psi front, 21 rear, with a single layer of gorilla tape inside.

Now its time to go test them out!!

 

[dustyduke22]

Just got my Speccy 2012 Camber Comp set up with WTB Trailblazer 2.8's on Blunt 35's with 14/15 DT spokes, brass nips and BHS hubs. Fits fine, no issues at all. May be able to go with a 3.0 when a suitable one comes out, willing to try for sure. Front fork is an x-fusion Slide 120, no fitment issues there either. Running 19 psi front, 21 rear, with a single layer of gorilla tape inside.

Now its time to go test them out!!

Let some air pressure out!! Try to start about 5 psi lower

 

[shmtastic]

That was as low as I could muster. I'm 215, riding in very rooty and rocky New England. As it is, I'm not sure if I felt the rim touch any, but there were a few times it was close. I think I'll stick there for now. I'm 16/17 on my 29+, but there's definitely more volume and wider rims.

 

[Ze_Zaskar]

Any reports on the Surly Ogre (or Karate Monkey)?
I'm pretty sure the WTBs will fit, but if the Trax Fattys 3.0 or 3.25 can go in then I'm drooling

 

[nitrousjunky]

Any reports on the Surly Ogre (or Karate Monkey)?
I'm pretty sure the WTBs will fit, but if the Trax Fattys 3.0 or 3.25 can go in then I'm drooling

Here's a KM with FBN tires on Velocity 45mm Dually rims. https://surlybikes.com//uploads/blog/KARATEMONKEY.jpg

 

[Ze_Zaskar]

Thanks, that's nice.

Wonder if the big Trax Fatties would fit as well

 

[nitrousjunky]

Thanks, that's nice.

Wonder if the big Trax Fatties would fit as well

Here's some pics the guy put up of clearance. He ended up going to the WTB Trailblaser to get a little more clearance.

 

[shmtastic]

I think I am going to give the Bridger a try later this summer when/if it comes out. Get one for the front and just try it on the rear to see if it will clear like I think it will, then order another if it clears well enough. How does wtb do with getting products they reveal out on time?

 

[PHeller]

Looks for pics of B+ clearance on the Salsa Spearfish or other 80-100mm 29er that can be found used fairly cheap.

 

[nitrousjunky]

Here is a B+ Split Pivot Spearfish pic

 

[PHeller]

Here is a B+ Split Pivot Spearfish pic

Any clearance pictures?

 

[nitrousjunky]

Any clearance pictures?

Sorry it isn't my bike, I saved the pic off of FB. All I know is that is P35s and WTB Trailblazers.

 

[dustyduke22]

Inspired by Dustyduke, here is my 27+ set up.

Nice!!!

 

[dustyduke22]

2015 Fox 36 will B+

I threw on a 150mm Fox 36 on my Yelli over the weekend and sure enough, it will B+. The clearance is ample, but not quite as much as my Pike. I don't know if I could run a Fat B Nimble with the 36, whereas I know I probably could with the Pike I can get some close clearance pics if anyone wants them.

 

[quelocotony]

Has anyone on this thread looked into converting a Niner SIR 9 to B+.

I like the idea of being able to adjust the BB height with the EBB and still be able to run SS. A 27.5+ SS is my goal and would love to be able to use my existing 2014 SIR9 Frame and i9 hubs for the conversion. Thinking maybe the Dually or Blunt 35 with 2.8-3.0 tire.

06HokieMTB, great chart -- thanks for posting!

 

[Reporter]

My MCR is on the way to be set 27.5+, with Dually+WTB TB. I will share info when ready.