Rigid Fork Size/Geometry Question

[taocat]

Last year at the Poor Farm Fall Cup race I won a Klein Attitude frame. I'm planning to build it up as a singlespeed, and I figure that anything worth doing is worth doing differently, so I'm thinking of going with a 26" rear/29" inch front wheel with a rigid fork (I've read good things about this combo...). The only thing I can't figure out is what size fork to get that will preserve (as closeley as possible) the geometry of the bike. It's size large frame with a 71.4 degree head tube angle and a 72.8 degree seat tube angle. Recommendations?

[allencb]

If it's a recent frame, it would have been designed for an 80mm fork. You'd probably want a shorter fork to offset the extra height offered by the 29er wheel, but I don't know if you could fit that wheel in a fork short enough to maintain the geometry.

I have a Pulse, the Attitude's poor cousin (same geometry, less expensive construction). It rocks with a rigid fork, it actually handles much better. I'm clearing stuff now that caused problems when I ran suspension.

Chris

[taocat]

I'm currently watching a On-One fork on Ebay. It says it's for a 26" wheel, but as near as I can tell it would easily clear a 29 - I believe it's the 100 mm eqivalent.

[eloach]

I think you need at least 440 mm crown to axle, like this:

https://www.pacecycles.com/product.asp?catID=2&subcat=478

Pace also has this, but it may be that it is too tall and will mess up the 26" geo:

https://www.pacecycles.com/product.asp?catID=2&subcat=460

Jenson USA can tell you on the phone, as well as others who sell PACE stuff. That would give you a good idea of the mm you need even if you went with a more affordable fork.

I have the 420 mm on my frame. I should have gotten the 440.

[allencb]

I'm currently watching a On-One fork on Ebay. It says it's for a 26" wheel, but as near as I can tell it would easily clear a 29 - I believe it's the 100 mm eqivalent.

Before you buy/build, you're more than welcome to meet me at a Wakefield night ride to try a 29er wheel in my fork. It's a rigid Dimension fork suspension corrected to 80mm.

I'll be there tomorrow.

Chris

[cbashaw]

The On one fork is 440mm

http://webcyclery.com/product.php?productid=17358&cat=319&page=1

Also look around for a planet X superlight fork it is exactly the same as the on one with different paint.

Check on the trials message boards you can sometimes find them cheap there. www.observedtrials.net

[drevil]

The On one fork is 440mm

http://webcyclery.com/product.php?productid=17358&cat=319&page=1

Also look around for a planet X superlight fork it is exactly the same as the on one with different paint.

Check on the trials message boards you can sometimes find them cheap there. www.observedtrials.net
Yeah, a lot of the latest 26" forks with mondo clearance, such as the Surly or Dimension, should be able to fit 29" wheels. I even have a 26" Kelly w/ 430 mm A-C that fits a 29er Nevegal with good mud clearance.

My advice is to go as short as you can with enough mud clearance.

[riderx]

All the info you need, courtesy of The Rag (http://www.dirtragmag.com/print/article.php?ID=860)

[taocat]

All the info you need, courtesy of The Rag (http://www.dirtragmag.com/print/article.php?ID=860)
Perfect! Thanks!

[redclayrambler]

Using the already mentioned/linked dirtrag "how to", I am running a 29er front wheel on a 26 inch frame (old Rocky Mountain Blizzard) and it seems to work really well. I used a Surly 1x1 rigid fork, there's clearance for a 2.1 (I think) Maxxis Igniter, but not by a lot. Lots O Fun!! Oh yeah, as the article mentions you need to run a disc on the front.

[taocat]

I've hit a snag already - I don't know why I thought this was a size large frame but when I pulled it out to start measuring things up, I discovered that it's a size small (doh!!). So off to Ebay with it and perhaps I can make enough to buy a different frame that I can use to continue this project!

[allencb]

Bummer. If it were a medium, I'd consider buying it.

Chris

[riderx]

So off to Ebay with it and perhaps I can make enough to buy a different frame that I can use to continue this project!
Cheap frame (http://www.nashbar.com/profile.cfm?category=6000130&subcategory=60001176&brand=&sku=14736&storetype=&estoreid=&pagename=Shop%20by%20Subcat%3A%20Fr ames%2FBikes)

[taocat]

Bummer. If it were a medium, I'd consider buying it.

Chris
If it was a medium it would fit me - I'm 5'10" so I fall right in the overlap between a medium and a large frame...