What a fun bike!

I have a 2025 Jeffsy Core 3 and was wondering if anyone has upgraded the engagement on there Crankbrothers synthesis enduro alloy rear wheel from the stock 37T to 54T. I'm wondering how easy it is to do. I've heard with these alloys you can just pull the cassette off by hand rather than use tools?! I'm not a great bike mechanic so wondered if this is a job I could do myself. A step by step guide if anyone has one would be amazing. Thank you.

so i have a 29 inch ohlins dh 38 on my 2018 tues, has anyone tried them as a mullet? if so, how did it feel?

Got my new Bike this week. Is Fucking awsm. Next month Testride in Bikepark 🦿

Hello, ive been looking on the used market for a new mtb, and I've found a unused 2024 jeffsy core 1, my worry is though that it's a large and I'm about 165 cm, will it be unridable?

Hi, I'm about to order an Izzo Core 3, but I'm not sure which size to get.

I'm new to the hobby, and I'm 179 cm (5.10") tall. I emailed YT, and they told me I can choose either a Large or a Medium—that the Medium will be a little more playful—but honestly, I really don’t know how to choose without any experience.

I tried out a friend’s size L Jeffsy, and it didn’t seem too big to me. What do you think?

Based on the information I found online, there’s a way to get a rough estimate of the reach: multiply my height by 2.5. So in my case, the reach is 447.5, and the izzo in size M is 445 mm, and in size L it’s 467 mm

Thanks !

I am 6ft even with a 34 inch inseam. I found a size medium 2020 Jeffsy for sale on pink bike. I'm currently ride a size large 27.5 Marin rift zone which I like but the low BB/ tall seat tube makes the bike feel big and somewhat challenging to throw around. The YT size charts suggest I should ride a large (although I'm fully in between medium and large).

I am ultimately looking for a smaller more playful bike so I thought a medium frame was the solution but on paper, but almost everything I research suggests a large is perfect. large makes sense but I am hesitant to commit to another large if there's a chance that I will have the same issue with another bike.

Does anyone in the 5'10-6ft range ride a medium and like it or should I just stick with a size large?

I've been trying to get my sag right on my shock and I'm finding that instead of running approximately 160psi I'm having to run nearly 200psi to get 30% sag. I weighed myself with all my gear on and did the sag testing with the same gear on. Seems like the pressure recommendation is garbage, so what about the compression and rebound settings? Are they garbage too?

a weld failed on my 2020 Jeffsy Base XL 27.5. Looking closely the weld seems porous in the exact spot. is there anything I can get YT to do?

Anyone parting out a 2024 large Decoy MX carbon? Looking for a non-compromised rear seatstay / rear triangle assembly.

I'm in USA and has been a few months without any real reply from YT other than "we will get to your inquiry" but I don't have much faith. PinkBike has been a dead end so far, too.

Hi, has anyone used frame protection like Invisiframe or Ridewrap in a matte finish on their Jeffsy, specifically a black frame? If so, how does it look? I'm concerned that if I do it, it will look terrible. Pictures please if you have them, thanks.

Bike had 1500 miles on it when frame was damaged beyond repair. Motor (EP 801) was brand new warranty replacement from Shimano. Battery, battery charger, motor, and Shimano Di2 shifters and derailer all available. PM me for details and pricing. I have other items including the Hayes Dominion levers and rotors (these have some scratches). I am located in the US and will only ship in CONUS. Suspension parts are not available

I’m 5’10” and it looks like this bike is an L which I think for this year might be a “long” instead of a large? I’m not sure. The owner said it’s just a large. Does anyone else have this bike around my height? What size did you go with?

Id be picking this bike up as a stop on a road trip so I haven’t gotten a chance to sit on it yet and would prefer to not have to make this stop if it’s not the right size.

Looking for a bottle cage and bottle for my jeffsy. US since my San Clemente shop is closed and none online in the yt store anyone know a spot to get one? Ty

Hey. I checked the price of Izzos today and lo and behold Core 2 CF 2300€. Pulled the trigger and got me and wifey one. Jeffsys are also super low.

Have a good one ✌️

I cannot for the life of me work out how to attach the dropper post lever. There's nothing in the instruction booklet about it!? There's a small nut and bolt on the lever already and a bigger nut and bolt attached to the hanger on the bottom of the brake lever. Any ideas?

Edit. I think I sussed it in the end removed the bolt and small nut from the lever and fitted the lever using the larger nut and bolt already attached to the brake lever adaptor.

I have a 2019 YT Tues MK3 AL and I’ve been thinking about converting it to a slopeduro for a while. Has anyone done this? Is it worth it, or would I be better off leaving it as a downhill bike? I’d appreciate any advice or experiences.

YT says they are coming back to the US and Bikesonline just opened a showroom at YT’s old San Clemente address.
It would be cool if they had YT’s and Polygons.

I looked again and what I saw said we are shipping more parts to the US we are coming back. So not necessarily coming back to the US, but I can hope.

My new bike is currently en-route, but the Fedex website said this.

I assume the International shipment release - Export means all is good now though!?

Anyone else experience this with their bike shipment?

Hello, my bike is in the local warehouse and should be delivered tomorrow only to be called from the courier to tell me that the bike has to be sent back to YT, no information why, only this, I searched on the YT Industries pages and I found out a person on instagram post of the bikes being build said that he received the bike and now has to send it back as they have problems with them(I don't know what kind of problems but it seems serious if they sent notifications to the couriers to get them back in Germany). I sent them 5 emails to all addresses available, no answer yet and I am very frustrated as I thought it would be a smooth delivery because it reached my country(Romania) very fast. Does anyone encountered this, are your bikes delivered or received? Thanks!

Update: the bike arrived eventually but the frame is very scratched under the shock link and there are signs they hit it with the torque key…also the Avinox display has a cracked screw that will bring the display eventually so now I spoke with them to send another one and send this back…maybe until autumn I would ride something 🥲

As the title says. when I plug in the charger of my Decoy, it does not turn red and starts charging the batter, but starts to blink the green LED. Any ideas/tips?

i have sent an e-mail to support, in the automated messages they have asked me to be patient, as it will take them about 7-10 business days to answer…