Can you post a link of the saddle ?

https://www.aliexpress.com/item/MTB-road-bike-Comfort-MTB-Wide-Bicycle-Seat-Carbon-Fiber-Bike-Saddle-Bicycle-Saddle-Bike-Seat/32766321631.html

It's a good one. Its incredibly lightweight and comfortable. 5 of my riding buddies bought it now that they saw mine.

In the topic of this frame.

Have you guys noticed that the Brake Caliper sometimes is mounted in the chainstay and sometimes in the seatstay ?

I have an M06 and it's mounted in the chainstay because the seatstay flexes with the wheel travel. If no shock is installed the frame still stays erect, the seatstay acts like a spring.

Wondering if anyone has a 258 in hands and can check if there is flex or smooth operation in the whole travel.

So I know you've posted around a bit with this question (mtbr and here), and I have the M9007 with this mount, and I have to say I don't really understand what the issue is.  No matter whether the brake is on the seatstay or the chainstay, it's part of the sprung rear triangle, and it's going to affect suspension kinematics under braking equally. When I ride while braking in the rear I don't notice any differences in suspension activity or any lack of braking efficiency.

I bought a 19” boost M9007 frame from Pro-Mance with ultralight T800/T1000 construction. Trailside weight of my build is just under 21 lbs. I am very impressed by the character and handling of the bike, not to mention the weight.

This mold was opened and licensed to three companies (marketed as Pro-Mance M9007/M7007, Hongfu HF-FM258, and TanTan FM078). Some additional adjustments were made to the mold: Hongfu modified the top-tube/seat-tube junction to resemble the Scott Spark while Pro-Mance introduced a boost option. Additionally, Pro-Mance is able to custom manufacture an ultralight T800/T1000 carbon fiber version of this frame (about 150g lighter). Of any XC 29er open mold, this frame looks to be the most aggressive, with the geometry being remarkably similar to the Scott Spark and the weight being the lowest of any chiner FS frame to date. That is, until the new Workswell frame hits the market later this summer.

CONSTRUCTION & FEATURES
The T800/T1000 ultralight M9007 boost frame from Pro-Mance is claimed to be 1850g for a 19”, though my frame (with derailleur hanger, cable routing ports, and shock mounting hardware) weighed 2020g. I did have it painted, but the weight is still heavier than anticipated.

The suspension linkage is carbon. Frame hardware is alloy. There is no squeaking or creaking through suspension compressions, an issue I have had with ICAN frames where plastic hardware was used. The shock hardware provided with the frame is a non-standard size that doesn’t fit Fox hardware, but I was able to find bolts to match Fox kits at the hardware store. The rear axle is heavy, I recommend an upgrade.

The internal routing is easy to set up, thanks to an accessible and thoughtful layout of the ports. The rear brake and derailleur cable are routed underneath the bottom bracket where they are susceptible to damage on impact. The rear brake caliper is mounted on the seat stay, while the cable routing port is on the inside of the chainstay and quite close to the axle, making for an awkward routing situation.

A single bottle mount on the downtube fits medium and small bottles. The frame is dropper compatible and should fit long travel posts. The bottom-bracket shell is press-fit.

I went with the boost M9007 frame to be certain I can ride 27.5x3.0 tires in addition to my 29x2.25 pair. There is probably not enough clearance for a knobbier or wider tire in the rear. The chainring clearance is also quite limited, I don’t think a 38T would fit, and I haven’t tested a 36T, but that would be tight as well. No chainstay protector mechanism is built into the frame, so you’ll want to find your own solution for that.

GEOMETRY
The M9007’s geometry falls into the aggressive XC category, with numbers very similar to the Scott Spark, though not identical.

BUILD KIT
Following proper weight weenie protocol, I gram-counted everything. However, I bored of this attitude and shifted towards putting together a smashing race-ready build. The trailside weight is just under 21 pounds. Sub-20 certainly was possible.

Suspension
The suspension is Fox Factory, with a boost Float 32 SC up front and a Float 6.5”x1.5” DPS shock in the rear. Neither have remote lockout.

Drivetrain
The drivetrain includes a RaceFace Next SL G4 crankset with OneUp boost 32T round/oval Switch chainring, SRAM XG-1195 cassette, and Shimano XTR 1x11 derailleur/shifter.

Brakes
Brakes are XTR Race with Ashima AI2 rotors. The power is not great, but enough for my Midwest XC riding.

Cockpit
The cockpit is the popular padded carbon saddle from Aliexpress (absolutely recommend), a Chiner 720mm flat carbon handlebar (tried 7 models, this is the only one stiff enough for me), Kalloy Uno 60mm -7o stem, silicone grips (orange are on the way), and a Chiner carbon seatpost.

Wheelset
A 1280g wheelset from Speedsafe helped keep things light and affordable. Boost DT Swiss 350 hubs were laced to monocoque 310g 24mm-wide 29er carbon rims with Pillar Xtra-Aero spokes and Pillar alloy nipples. Wheels were excellently tensioned and trued and shipped within 2 weeks. Tubeless setup required an air compressor due to hookless sidewalls. Order from Aliexpress. Speedsafe knows their stuff, I highly recommend them. I’ll write a separate review on the Speedsafe wheels after a thousand miles. At present they feel featherweight and I love the stiffness. I am mainly interested in the rim durability long-term.

Tires
Tires are Maxxis Ikon 29x2.25 3C/EXO Skinwall, and I’ll ride them till they break and then get something different—maybe an Ardent in the front and an Aspen in the rear. Traction is not as anticipated. Tubeless setup.

Other parts
Lots of little details also shave weight. Some Ti bolts, Syntace rear axle, carbon seatpost clamp, lightweight shift cable housing, stingy amounts of sealant, XTR pedals, carbon bottle cage, etc.

RIDE IMPRESSIONS
I have just 30 miles of Michigan singletrack on this bike so far, but I am incredibly pleased with the feel. A friend of mine also bought a Spark RC Pro bike, and I’ve got to say the bikes would feel identical except that my bike is 3 pounds lighter. We both come from hardtails, so we are absolutely shredding the gnar and loving every mile. At 6’2” the 19” frame size is working well for me, although I might go for a 21” if it becomes an option.

I think you can read any Spark review and apply the characteristics and handling of the ride to this frame. At 21 pounds, acceleration on my build is almost effortless--it climbs like a goat and descends like a beast. It shines most in the technical climbs, there just isn’t a bike built any better for these sections than a lightweight FS with a steep HTA.


AVAILABILITY & LOGISTICS
Hongfu, Tantan, and Pro-Mance are all stocking this frame in 15”, 17”, and 19” sizes. If you want boost, go with Pro-Mance, if you want a Spark-esque seat tube/top tube junction, go with Hongfu. I was personally very happy with the customer service that Al Zhu at Pro-Mance provided. He was always fast to reply, transparent about how things were going, and handled my special requests patiently. I recommend negotiating on the price. Hongfu has a special pre-order offer at the moment, but chances are Pro-Mance can match that price.

I waited 4 months to get my frame. I ordered something that was not in stock, needed custom-cut paint decals, and I ordered right before 3 weeks of Chinese New Year holidays. But I also got a good price. I recommend avoiding my mistakes to help speed things up for you. You can get frames that are in stock in as quickly as two weeks.

Can you share more information on the FM289?  hongfu-bikes.com is down so I can't look into it.

My frame is on the way!  I'll post up with a detailed report once it all comes through. Everything is waiting to get built up, targeting 20 pounds. The bike in this thread really inspired me to pull the trigger on this frame for my personal ride, although I was in touch with Pro-Mance before this frame was first produced.

I got the ultralight frame (T800), which took a while to manufacture, then made the mistake of ordering a complicated paint design, so I've been waiting 3 months now.

I have a great experience to share with the ICAN SN04 full-suspension fat bike model.  It is quite something for a company to open a mold for such a niche bike like this, and after some deliberation between the other full-sus fat models (Angle Sports and Xiamen Carbon-Speed, specifically), I pulled the trigger on the ICAN. The price was $50 more than the competition, but the frame was kitted up with better hardware, screws, and the service was stellar.  Shipping was faster than any of the other 10+ open mold frames I have ordered over the years.

Out-of-the-box Impressions
The paint job was spectacular, and the frame came well packaged and really caught my breath when I put it on the stand--it is so well finished! I thought Salsa Bucksaws looked trick, but this thing really does!

Riding Impressions
Geo is very reminiscent of, shall we say, the bucksaw.  It rides a lot like a bucksaw, feels a lot like a bucksaw, and similar suspension kinematics.  It feels heavy on the uphills, but unconditionally roars on the downhills. That's going to be the reality with most full-suspension fat builds, and I had mine built up with various kits to between 32.5 and 35 pounds. I took the 35 pound build down the trails at Burke Mountain Bike Park in Vermont, and can't forget the priceless expressions on the lift assistant faces when they lifted the fat bike onto the chair. They remarked that they'd never had anything heavier or bigger on the mountain.

At it's best with an ultralight carbon wheelset, 4.0 Jumbo Jims, and a RockShox Bluto fork the bike was ridiculously fun on dry singletrack, but uphills were tough. At it's worse with 4.8" Vee Snowshoe XLs and a Manitou Mastodon comp fork, the bike was alright on groomed singletrack and absolutely lead-heavy uphills--not fun at all.

Maximum Tire Size and Warranty Experience
I broke the rear chainstays with a 4.8" tire fully inflated while running a RockShox Monarch RT3 at ~280 PSI. This tire size is too wide, and I'd never recommend going over 4.5", I don't see why you'd have to.  ICAN was extremely fast to reply to my warranty request, however, and sent TWO--not one--replacement chainstays with hardware by express DHL.  Absolutely phenomenal service!  Absolutely recommend this company.

Afterthoughts
This is not a bike for un-groomed snow, wide tires, or a do-it-all kind of rig. It's very niche, but super-fun on the downhills. I'm a ride-and-sell kind of guy, and I usually get my money back after building a bike.  Of 10+ bikes I've built up, ridden, and sold, this was the only one I lost money on, and I lost over $800 on it.  But it was incredibly fun to ride when built up at 32.5 lbs, it was just too niche for me and I didn't need FS fat. ICAN has done a wonderful job with the frame design, customer service, and warranty fulfillment, but I would just encourage anyone looking at full-suspension fat to really consider what they are looking for in a bike and how much they are willing to spend.