120mm forks on a 29er inbred...

G'day Rick,

I think the manufacturer would be the best to ask about this, but for what it's worth, here is my lowly opinion.

The main concern with the front end of the 29er is that the head tubes are shorter and the axel to crown is longer, placing more leverage on the head tube when compared with a 26" bike.

120 is 20% more than 100 but I do not think the leverage is 20% greater for two reasons. Firstly, the fork is attached to a round rolling wheel, not wedged in the dirt and acting like a fulcrum on the fork and head tube. Secondly, the head angle will be slightly reduced, slightly reducing the leverage on the fork and head tube.

Also consider that a suspension fork can absorb the rough stuff where a rigid fork cops the lot and these Inbreds are built up rigid all the time. I'm about to do it myself.

The Inbred is a lump. Mine is 2700g, so there's no shortage of metal in there. There's also plenty of examples on the forum where people have put a 120mm fork on a bike made for 80 - 100mm to slacken it a little with success. Even my FS bike, Salsa Big Mama has had 120mm fork installed by members here who like the result.

Again, I'd ask OnOne about it, but can't see what the problem might be as long as your willing to accept the angle changes. The "sizing info" page on their web site shows all sorts of long fork on their bikes.

Good luck deciding.

i'm running 120mm on my one-one 29 Ti....it's been 6 moon allready.

i loves them,..it's feel like all mountain + xc capable,and used it as my racing bike,..SS it is.
when you're on board your bike,the fork compressed to 100mm-80mm...so no biggie.
coz i like it slacker,...
just make sure you run shorter stem tho(80mm)

Sorry, if might help, not an Inbred, but I have a Raleigh XXIX Pro with a 120mm Thru 20mm axle Rockshox Reba Team and no problem so far after one year.

brant said:

It was designed as an XC frame with a 100mm max fork.

If you ride it with an 120mm bolt through fork, like how a 120mm bolt through fork is meant to be ridden, you should be hitting things harder.

If you're not, you don't need an 120mm bolt through fork really.

Click to expand...

fair enough. after stumbling across an interview w/ you recently where ya made ref. to the fact that you didn't get into the design/building game to answer individual email requests, i didnae want to burden ya with further requests...so thanks fer chiming in.

my original question is based around the fact that as my confidence rises, i'm throwing my 200 lb. frame off bigger drops and jumps (eg. spending more time in the freeride park at glentress and hitting most things - some of the doubles i'm still working up to - on caddon bank at innerleithen, to give ya an example/reference point).

thus far, the reba (2007 w/ a DT 9mm skewer) is holding up well, though a bit more travel would be welcome. so, rather than wait for a british based company to get a cheap longer travel frame happening, i'm just wondering if i can stick a newer, longer fork on it without worrying about added risk of frame damage.

as with many/most people, i find i ask questions about my gear most when i ain't using it and with this snow and ice lingering, i have stayed on the road and am somewhat anxious to get back on dirt/mud.

so, brant, are the physical forces exerted on the on one inbred 29er by a 120mm fork something i should worry aboot?

(god, i'm boring myself with all this hypothetical mumbojumbo, so sorry to all who are still reading this thread...)