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Thread: 26er with 650b front only

Started 2 months ago by bidaci
I have a Giant AC1 that I usually run 2.35 to 2.5 26 inch tires. Do to an injury I swapped the normal size tires to a smaller 26x2 figuring I would lighten the bike up and enjoy non technical singletrack and fireroads more. What surprised me was over all the bike was so much responsive even in some of the tighter singletrack. What was a problem was I noticed the front tire getting stuck on rocks...
Site: Mountain Bike Review Forums  Mountain Bike Review Forums - site profile
Forum: 96er, 69er Bikes, 650b or 27.5  96er, 69er Bikes, 650b or 27.5 - forum profile
Total authors: 14 authors
Total thread posts: 41 post
Thread activity: no new posts during last week
Domain info for: mtbr.com

Other posts in this thread:

MMcG replied 2 months ago
I say go for it - especially since your fork - the Psylo - has ample room for 650b!

derby replied 2 months ago
Compared to a 26 inch wheel, it may add about 100 grams, if that much, using the same width 650b tire, rim, and longer spokes. Doing 650b front only raises the front of the frame 1/2 inch and steering becomes a bit more floppy, similar to using a much larger front tire for handling changes. It slacks the fork angle and slows turning - similar to the feel of raising the fork travel 1 inch ...

Davidcopperfield replied 2 months ago
Quote: Originally Posted by bidaci No hucking, no drops Yes/No? Thoughts? Giant AC1 Rockshox Psylo Had a IRC Kujp 2.35 at one point and a Maxxis Mobster 2.6 but they are to damn heavy. Yes I know small wheel do not work so well. Have you thought of makign it 69er? Just get a 100 or 120mm fork and 29" wheel and if ...

bidaci replied 2 months ago
Quote: Originally Posted by MMcG I say go for it - especially since your fork - the Psylo - has ample room for 650b! I wouldn't expect anything less from you. But what took so long for you to answer? Quote: Originally Posted by derby Compared to a 26 inch wheel, it may add about 100 ...

TNC replied 2 months ago
bidaci, IMO this is the beauty and logic of 650B. One doesn't have to sacrifice travel or odd geometry to get a slightly taller wheel/tire combo. Personally I still like 26" on the rear, but I have been totally convinced on the performance benefit for the front to be 650B on both my Nomad and '08 Stumpjumper FSR. I rode both of these bikes for some time with a 26/26 setup, and there's no ...

enFuego replied 2 months ago
Putting a Neomoto on the front of my 2003 Santa Cruz Superlight was an improved bike, for me. It lead me to go for a 09 Heckler with 650B front and rear, which is working nicely for me. I'll try to attach some pics here of a side-to side comparison of a Neomoto next to a 2.5" Nevegal. For me, I liked the improved roll-over-ability of the Neomoto, but then again, I ride slow. I couldn't tell you ...

MMcG replied 2 months ago
That second image is a very good image showing the size diff.

umarth replied 2 months ago
For my riding style, a 650b front and a 26" back is probably near perfect. I appreciated the slack angles.

keen replied 2 months ago
keen - with all due respect, I don't get where you are coming from. I think the most important point is what bike you start with and how steep it is upfront. Exactly you don't know where I am coming from. If you do the math steering reposnse will not be the same - there is a change in front end height and fork trail . If you start w/ a steep HA the effects of a 650b may not be as ...

elrancho66 replied 2 months ago
Quote: Originally Posted by MMcG I say go for it - especially since your fork - the Psylo - has ample room for 650b! I say go for it also and see if it works for you. I have been running a Nevegal with a Velocity 650 B Blunt on the front of my Kona A Full Suspension SS rig and it's a blast,,,,,,,,26 out backright now but there is ...

 

Top contributing authors

Name
Posts
bidaci
6
user's latest post:
26er with 650b front only
Published (2009-11-07 07:52:00)
Quote: Originally Posted by TNC Honestly, I think you guys may be obsessing about the effect of the 650B/26 setup on many bikes. I've done an SC Nomad and an '08 Spec Stumpjumper, and neither bike had screwball geometry or weird handling traits. The geo doesn't bother me. My obsession is with wieght
salimoneus
5
user's latest post:
26er with 650b front only
Published (2009-11-08 12:13:00)
Quote: Originally Posted by TNC sal, ever wonder why dirt motors have generally settled on a taller wheel up front and a shorter wheel out back?...in the case of my dirt motor, 21"/18". The total tire and wheel measurement comes to 27.5"/25.5". Remember back when they even tried to go to a 23" front wheel, but it ate up too much travel in the fork and/or dinked up the geometry too much? A taller front wheel is an...
JMac47
4
user's latest post:
26er with 650b front only
Published (2009-11-08 12:13:00)
Quote: Originally Posted by keen Maybe if my bike had a 70ish* HA it wouldn't have been as noticable but like I said depends on your sensetivity level. 17" 100mm fork frame geo w/ 71* head angle. I run a tall WTB WW 2.55LT in back anyway so that should help to level the back end up with the trail I would think. I will be running a 2.1 up front either Neo, Nev or Wolverine if it ever comes oout in production.
keen
4
user's latest post:
26er with 650b front only
Published (2009-11-07 00:52:00)
Quote: Originally Posted by JMac47 Just like the way it rides now but want the benifit of the bigger wheel without the flop factor. I think it really depends how sensetive you are to wheel flop. I rode DH bikes for years w/ 65-67* HA's and never gave any thought to wheel flop or slow steering. Fast forward a number of years I have been riding trail bikes w/ 68-70* HA's and now I can really feel the effects of a slack bike. My...
reformed roadie
4
user's latest post:
26er with 650b front only
Published (2009-11-08 14:13:00)
Quote: Originally Posted by salimoneus Which kindof goes back to my original assertion.. It's entirely possible that if your frame would fit a 650b rear you would be raving about it's advantages just like the front. I am just wondering if people are mostly running this because they have no other choice, or because even though they could run both they feel this is a better configuration. Well...consider the 69er. Clearly the rollover...
TNC
4
user's latest post:
26er with 650b front only
Published (2009-11-08 13:13:00)
Quote: Originally Posted by salimoneus Which kindof goes back to my original assertion.. It's entirely possible that if your frame would fit a 650b rear you would be raving about it's advantages just like the front. I am just wondering if people are mostly running this because they have no other choice, or because even though they could run both they feel this is a better configuration. The fact that dirtbikes run with mismatching...
MMcG
3
user's latest post:
26er with 650b front only
Published (2009-11-03 19:48:00)
That second image is a very good image showing the size diff.
umarth
3
user's latest post:
26er with 650b front only
Published (2009-11-08 12:13:00)
Quote: Originally Posted by salimoneus Does anyone else believe that this particular configuration (and 69er as well) just isn't all that interesting? You should try it. I think big wheels are necessary in the front, but the small disadvantage of traction/rollover in having a 26" wheel in the back is more than made up from its ability to speed. Currently I have 650b front and back (SS), and while it is a little smoother and traction...
88 rex
3
user's latest post:
26er with 650b front only
Published (2009-11-08 12:13:00)
Quote: Originally Posted by salimoneus I don't recall ever seeing any other offroad vehicles like dirtbikes or 4-wheelers or Jeeps that have mismatched wheel sizes front/back. Are you trolling for giggles or are you serious? The set-up works well.
enFuego
1
user's latest post:
26er with 650b front only
Published (2009-11-03 19:48:00)
Putting a Neomoto on the front of my 2003 Santa Cruz Superlight was an improved bike, for me. It lead me to go for a 09 Heckler with 650B front and rear, which is working nicely for me. I'll try to attach some pics here of a side-to side comparison of a Neomoto next to a 2.5" Nevegal. For me, I liked the improved roll-over-ability of the Neomoto, but then again, I ride slow. I couldn't tell you which of the two tire set-ups has...

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