I in no way need that, but man is that a good price. I paid that much for my GX crank.

 

Does 4" mean a shorter spindle or just the ring it comes with is offset?

 

Just the offset ring, identical to the FAT5 except for the chainring. Luckily I have a spare FAT5 (-4mm) ring, so one of my bikes will be getting a very nice crank upgrade. Anyone need a FAT4 chainring in like new condition?

 

165 or 170 would have been killer...

 

Most of the time, I've been able to find a deal like this on my XX1 cranksets. I use 30mm, non-dub, because changing bearings is far easier, but these always seemed to on a crazy sale at some point, heck, you could pick up the XC versions and swap the axles, like I did.

 

..you could pick up the XC versions and swap the axles, like I did.

are the spindles able to be swapped on these?

 

So this would fit a 2020 Beargrease? Seems like it, but the link is a bit skinny (ha ha) on details other than "fat bike".

 

It will fit but 2019-on Beargrease are 197mm so it will need a -4mm offset chainring (SRAM or other) to have the proper chainline. Also may need a different BB if you don’t already have a Dub one.

 

Isn't this the Fat4 which is for 170mm rear hub spacing?

 

Yep- but on the newer SRAM fat cranks they are the same spindle and cranks, just the chainring is different. 6mm offset for the Fat4 and -4mm for the Fat5 (it actually wraps around the crank arm a bit).

 

So if have aluminum SRAM NX-Eagle Dub Fat cranks attached to a SRAM DUB PF121 BB, I should be able to use my existing spindle and just the swap crank arms correct?

 

You should be able to just swap the chainring, as the spindle lengths are the same for the dub generation SRAM fat cranks, they just use different chainrings and spacers to fit. That being said I believe the NX cranks use a steel chainring vs the aluminum on the others so you'll have a heavy chainring on an otherwise light crank.

During the pandemic all I could find when I was building my fatbike was Fat4 cranks, so I ended up buying it and swaping in a Fat5 chainring.

Here is the spacer guide for SRAM bottom brackets: https://www.sram.com/globalassets/d...-hierarchy/compatibility-map/mtb/dub-mtb-bottom-bracket-compatibility-chart.pdf

 

If I have DUB PF121 BB and spindle...can I just swap in the XX1 Carbon crank arms?

 

I've always been confused about fat bike cranks and spindles and BB width. Mine has a 41mm x 121mm press fit BB currently running a GXP BB. Is this as simple as buying a PF121 dub bottom bracket and throwing this fat bike crank on there with the correct chainring and offset for my chainline? Seems like most everything is going 100mm shell nowadays and I just assumed cranks for those won't fit a 121?

 

A 100mm BSA shell will have 10mm of external bearing cups either side, so pretty much the same width. The chart posted above shows the spacers you'd need for PF121 DUB that would come with the BB. Looks like 2mm NDS, 6mm DS.

 

They are now down to $105 and they have the -4mm (Fat5) chainring on clearance for $43. For a whopping $148 you can have XX1 cranks for your 197mm fatbike! I just bought another set to put on my Blackborow- lipstick on a pig

SRAM Eagle X-SYNC 2 Direct Mount Chainring 30t, DM, -4mm Offset, Lunar Grey

SRAM Eagle X-SYNC 2 Direct Mount Chainring - 30t Direct Mount -4mm Offset

www.coloradocyclist.com

SRAM Crank XX1 Eagle Carbon Fat Bike 4" DUB Direct Mount 30t X-Sync

SRAM DUB technology creates a lighter, stiffer and stronger crankset Carbon-tuned lay-up crank design provides extreme stiffness and light weight Included direct mount X-SYNC 2 chainring...

www.coloradocyclist.com

 

Great deal for 175's.

 

Do these work with a Voytek (177 rear). Currently has next sl cranks and RF 107 press fit bottom bracket.

 

on my Salsa Beargrease , i mount a XX1 cranks fat 5 ( as indicated in the technical specifications of the Salsa site ) , it comes with -4mm offset , so i change the ring for an zero offset ring and i have perfect chain line .
but the cranks a this price it's really a good deal , unfortunately i'm not located in USA...

 

The cranks on clearance from Planet came with 6mm offset. I wish I would have read this before buying the -4... 0 offset looks optimal.

 

Finally bought this. Still looking for a -4 24t chainring.


(my fat biking has a lot of mountain climbing, I have a 28t now and it ls never too short and sometimes too tall. I can't walk up hills due to a knee problem.)

 

Finally bought this. Still looking for a -4 24t chainring.

A friend tells me NW Billet makes about any chainring under the sun (and Wolftooth can also be a good source).

I don't have the crank yet, so haven't started looking for the chainring, but others may have sources.

 

There are all sorts of chinese rings available on ebay and so on. I have some special needs for a few bikes, the Foes runs zero offset to gain a little more chain clearance for the tires and my canfield also runs zero. My other two are 6mm offset. Finding the right offset with the right spline interface is challenging and often non-existent from big mfrs, they have often "moved on". The chinese rings work great.

 

I've never come across any Chinese -4 offset rings. I have a zero offset Chinese 24t, 22t, and a Latvian steel 18t. They don't let the chain clear the J5's

 

Wolftooh CAMO chainring setup will get you down to 28T with their P2 reverse dish spider. (-4mm)

 

I bought a set when they were $150 and felt like I robbed the place. Guess I was wrong!

 

Also, these last few they are blowing out are faster than yours.

About $45 faster........... 🙃

 

Down to $90 now

 

Thanks. Just had to order a set.

 

bad news for me , i am in France and i wanted to order XX1 crankset , and no shipping method for my country .....

 

It looks like they do international shipping on a case-by-case basis:

https://planetcyclery.zendesk.com/hc/en-us/articles/11250573787540-Shipping-Policy

Might be worth a phone call or email to them?

 

So finding a -4mm X-sync 32t or larger chainring ain't easy. What if I just changed the spindle spacer configuration to align the chainline? I'm really hoping for a 34t chainring.

 

I think I have a brand new 32t or 34t -4 kicking around because I have zero use for that big a ring on a fatbike. These are rare?

 

I thought my zero offset was rare, I have to run that to get the right tire-clearance and not rub the chain on my tire on my 177 FS fat bike, but there's lots of these from Chinese mfrs out there.

 

Late to the party as usual. I’ve got the last model Farley 5, not the newest. Assume I would need to find the -4mm chain ring for this crank to work?

Edit- Well decided to just buy it. Free shipping even.

 

Late to the party as usual. I’ve got the last model Farley 5, not the newest. Assume I would need to find the -4mm chain ring for this crank to work?

IMO, you'll need something different, as mine came with a +6mm chainring IIRC.

 

I bought these cranks for a 2022 Beargrease and swapped the include 6mm chainring for a 30T -4 offset.
It's overkill, a 0mm offset would be optimal but probably limited to 28T to clear the frame.
The -4 puts the chain inline with the high gear and makes for a nasty cross to low gear.

 

I maybe have all this confused, since I've never before in my life had to mess with offsets, but I just put the -4 offset that came on my 2020 BG NX onto this new, fancy crank, and everything seems to line up just like before?

I though "minus" meant further inboard, so as to give better chainline in the low (50t) gear? I'll have to take a closer look at it later today, running off to help with a kiddie's mtb clinic first!

 

Fun stuff, I ordered their last GX Fat5 crankset two weeks ago...they sent me a crankset with a dirt covered and worn +6mm gear instead of the -4mm! 🙈🙈🙈 I only ordered the crankset because it was cheaper as a set than just the -4mm X Sync gear that I ordered two years ago.

 

FYI - for all of the people looking for -4mm X SYNC rings, the SRAM part number is:

11.6218.030.200

You can easily find purchase options with a Google search.

 

Or find cheap ones on ebay searching for x-sync -4 and your tooth count. Like 10-30 bucks.

 

According to Sram parts page the only -4mm chainrings they offer are 30t. Everything else in X-sync 2 is 3 or 6mm offset. I think I am going to go with a 3mm steel 34t and space it over using bb spacers.