Real nice.
Can use one of these for a total stack height of 145mm. Mojo MORC Crowns
I have a cane creek headset on my 40 with a reducer and it’s flush on the bottom and doesn’t increase the stack at all. Also, you can get a drop crown from Fox that will give you more room for adjustment.Fox 40's are 2022 and are super tight on the headtube, would be great if Pole reduced the headtube by 10mm to give more leeway? I'm using a hope headset which is fairly low profile and also a 1/5 to 1/8 headtube reducer which adds to the stack height unfortunately? Frame is a K3 with a seat extender to make room for my monkey long arms.
I looked at reducing the travel on the fork from 200 to 190mm but according to Fox's diagrams it takes the extra 10mm of travel off the bottom of the fork rather than the top so no dimensional gains on the top of the fork? The top crown is quite marginal but safe with the top of the sanctions inset into the top crown a bit. I've fitted the fox mudguard which will hit the bottom crown if bottomed out, but have increased a token and pressure slightly to compensate plus not doing anything super narrly ATM so won't be bottoming out.
Was contemplating running a single crown fork on it for now but I've built this a pedal assisted DH bike which I can do both no exercising XC occasionally and smashing out the laps at bike parks so thought Id leave it with the Fox 40's?
Rode the Alps with it this year and was great to be behind a 'proper' fork again, just a pain round those 180 deg switch backs and loading on the chair lifts cus its so long and heavy!!
It is a K1, and I bought the reduced offset dropped crown directly from Fox in 21.
Fox 40's are 2022 and are super tight on the headtube, would be great if Pole reduced the headtube by 10mm to give more leeway? I'm using a hope headset which is fairly low profile and also a 1/5 to 1/8 headtube reducer which adds to the stack height unfortunately? Frame is a K3 with a seat extender to make room for my monkey long arms.
I looked at reducing the travel on the fork from 200 to 190mm but according to Fox's diagrams it takes the extra 10mm of travel off the bottom of the fork rather than the top so no dimensional gains on the top of the fork? The top crown is quite marginal but safe with the top of the sanctions inset into the top crown a bit. I've fitted the fox mudguard which will hit the bottom crown if bottomed out, but have increased a token and pressure slightly to compensate plus not doing anything super narrly ATM so won't be bottoming out.
Was contemplating running a single crown fork on it for now but I've built this a pedal assisted DH bike which I can do both no exercising XC occasionally and smashing out the laps at bike parks so thought Id leave it with the Fox 40's?
Rode the Alps with it this year and was great to be behind a 'proper' fork again, just a pain round those 180 deg switch backs and loading on the chair lifts cus its so long and heavy!!
www.ridefox.com
Works components have an 8mm , and now 10mm, reach extender headsetWell, here’s a problem. I'm trying to fit a 2019 Fox 40 to my K4 Voima. Pretty sure it was a 52mm offset fork. Top-of-crown to top-of-uppertube is set at 137mm, can reduce to 127mm. Headset is a Chris King Inset 2 with a Devolution reducer.
FORK- 2017-2020 40mm User Specification Drawings | Bike Help Center | FOX
The stack of the bottom race and reducer is sadly quite deep. I would now need a drop top crown, if such a thing still exists from Fox. I’ll ask Silverfish.
The other problem is that the fork arch hits the head tube under not-even-close-to full compression. Photo shows fork with no air, compressed towards full travel, probably has another 10mm or more to go.
Questions for those with experience fitting a Fox 40 to your Voima:
Please don’t tell me to Dremel the back of my fork arch!
- Exactly which headset make and model did you use?
- If you’re using the Mojo Morc, did it move the arch out away from the head tube?
- Any other bright ideas?
Also, taking measures to prevent the fork using all its travel is not an option. It will not ride well.
Obviously, I don’t want to have to buy another fork. The intention was to take the parts from my Commencal Supreme 29 and run this as a self-shuttle DH bike.
Maybe a rebuild on a 2022 lower? Would that give the clearance I need?
Explore 40 Mountain Bike Forks | FOX
FOX redefines ride dynamics for ATVs, mountain bikes, motocross, off-road vehicles, snowmobiles, trucks, and UTVs.
"Modern frame designs and geometry trends require modern suspension design solutions. The arch design of the all-new 36, 38, and 40 is designed to pair perfectly with modern Enduro and Downhill bikes. Head tube profiles have grown larger and larger, and fork offsets shorter and shorter. Our new arch shape takes this need into account by jutting forward to provide ample headtube clearance at full compression. State-of-the-art computer modeling techniques helped us to create an organic lower leg shape that optimizes stiffness with the absolute minimal amount of material."
View attachment 100505
Good find, thanks, that might do it.....but I can only see 5mm on their website.
I can see now that I have options, even if they're not cheap....but I might even be able to get rid of that orange lower! That's a very valuable 20mm right there, all is not lost 
Well, here’s a problem. I'm trying to fit a 2019 Fox 40 to my K4 Voima. Pretty sure it was a 52mm offset fork. Top-of-crown to top-of-uppertube is set at 137mm, can reduce to 127mm. Headset is a Chris King Inset 2 with a Devolution reducer.
FORK- 2017-2020 40mm User Specification Drawings | Bike Help Center | FOX
The stack of the bottom race and reducer is sadly quite deep. I would now need a drop top crown, if such a thing still exists from Fox. I’ll ask Silverfish.
The other problem is that the fork arch hits the head tube under not-even-close-to full compression. Photo shows fork with no air, compressed towards full travel, probably has another 10mm or more to go.
Questions for those with experience fitting a Fox 40 to your Voima:
Please don’t tell me to Dremel the back of my fork arch!
- Exactly which headset make and model did you use?
- If you’re using the Mojo Morc, did it move the arch out away from the head tube?
- Any other bright ideas?
Also, taking measures to prevent the fork using all its travel is not an option. It will not ride well.
Obviously, I don’t want to have to buy another fork. The intention was to take the parts from my Commencal Supreme 29 and run this as a self-shuttle DH bike.
Maybe a rebuild on a 2022 lower? Would that give the clearance I need?
Explore 40 Mountain Bike Forks | FOX
FOX redefines ride dynamics for ATVs, mountain bikes, motocross, off-road vehicles, snowmobiles, trucks, and UTVs.
"Modern frame designs and geometry trends require modern suspension design solutions. The arch design of the all-new 36, 38, and 40 is designed to pair perfectly with modern Enduro and Downhill bikes. Head tube profiles have grown larger and larger, and fork offsets shorter and shorter. Our new arch shape takes this need into account by jutting forward to provide ample headtube clearance at full compression. State-of-the-art computer modeling techniques helped us to create an organic lower leg shape that optimizes stiffness with the absolute minimal amount of material."
View attachment 100505
Have you tested bottom out? That looks close. Also I know for the fox mudguard you need a minimum of 137mm per fox top of stanchion to top of bottom crown. With a Boxxer you need 163mm +\- 3mm.
Caincreek zero stack can do +3mm over stack if I remember correctly.
Thanks everyone for all the replies. I definitely have some calling around to do today, see what I can get hold ofI’m ordering this after I blow out this Boxxer.
Gabel-RockShox - m-suspensiontech GmbH
www.m-suspensiontech.com
I ordered this and it won’t fit.
Infinity - Intend
Rock gardens, roots and big features are the natural habitat of our Infinity DH fork - the perfect tool to find your own personal limit.www.intend-bc.com
But I have other DH bikes…
Yes I figured the the mudguard will fowl the lower crown if I bottom out so I've put in a extra token in and upped the pressure a bit to prevent a bottom out? I'm not allowed medically to do any harsh loads on my body till next year so it's all about mincing around doing easy stuff with no proper knarl ATMHave you tested bottom out? That looks close. Also I know for the fox mudguard you need a minimum of 137mm per fox top of stanchion to top of bottom crown. With a Boxxer you need 163mm +\- 3mm.
For fox it looks like you need the drop crown
MORC 40 (Mojo Offset Reduction Crowns)
Mojo s offset adjustable MORC crown system is now available for the F x 40 fork Whilst offset has been reduced to fine tune handling on enduro bikeswww.mojo.co.uk
@Onetime if you drop your stanchions in their crown flush with the top like @Tankboy you’ll make the seat a little more slack and not need as much stack height. Which will also bring the handlebars forward ~10mm for every 10mm of drop which takes more pressure of your wrists. Maybe even add a +50mm stem but I’m not sure how heavy that’ll make the front end. The stack height is already the highest of ANY bike I know of especially on 29er wheel! so lowering it to where it’s tolerable for flat riding would make for better DH riding…..but being comfortable for day to day riding is the balancing trick.
Thats awesome, looks like a proper freeride rig- how much travel and what year, about 2010ish?
Hey @Tankboy - The plan is to fit the Works Components +5mm headset and a set of Mojo Morc drop crowns. The 49 already has fart portsNickyTee - how you getting on with the Fox 40's? I was wondering if a set of current lowers would fit all the older components - plus you can fart your forks when you feel the need
