Chinese Carbon MTB > 29er
FM 158 and 258
sissypants:
--- Quote from: charlesrg on April 30, 2018, 09:18:48 AM ---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.
--- End quote ---
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.
lRaphl:
I think the problem is the fear that the caliper will move slightly with the flex in the seatstay and change its position relatively to the rear disc.
Jerryno:
Also because the seatstays are thinner one side gets flexed from the breaking forces and the other not. This may be an issue even on hardtails. Some aluminum frames suffer from this and I rarely see a good carbon frame with brake mount in seatstay.
Wirh 160mm rear this is small, but with 180mm the effect is much more.
danK:
--- Quote from: sissypants on May 01, 2018, 02:31:57 PM ---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.
--- End quote ---
Since you brought up suspension, is the shock tune of the aftermarket Fox a great match for the frame's kinematics?
Did you request a firm XC tune?
danK:
--- Quote from: RS VR6 on April 18, 2018, 02:56:02 AM ---158. Looks like 148 only.
https://www.aliexpress.com/item/2018-NEW-29ER-BOOST-Full-Suspension-Full-Carbon-MTB-Bicycle-Frame-FM158-148-12mm/32854553929.html?spm=2114.search0104.3.48.3fb91244sAY1xH&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_5722917_10344_10068_10130_10324_10342_10547_10325_10343_5722817_10546_10340_10341_10548_5722617_10698_10545_10697_10696_10084_10083_10618_10307_5722717_10059_5711217_10534_308_100031_10103_441_5722517_10624_10623_10622_10621_10620_5711317,searchweb201603_28,ppcSwitch_5&algo_expid=14ea6170-e624-4ec4-ab4e-da1f802f8f9d-7&algo_pvid=14ea6170-e624-4ec4-ab4e-da1f802f8f9d&priceBeautifyAB=0
258. 142 and 148.
The 258 won't ship till July.
https://www.aliexpress.com/item/2018-NEW-Carbon-Fiber-29er-Full-Suspension-Boost-148MM-MTB-Bicycle-Frame-FM258-UD-Matte/32854379761.html?spm=2114.search0104.3.30.3fb91244sAY1xH&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_5722917_10344_10068_10130_10324_10342_10547_10325_10343_5722817_10546_10340_10341_10548_5722617_10698_10545_10697_10696_10084_10083_10618_10307_5722717_10059_5711217_10534_308_100031_10103_441_5722517_10624_10623_10622_10621_10620_5711317-normal#cfs,searchweb201603_28,ppcSwitch_5&algo_expid=14ea6170-e624-4ec4-ab4e-da1f802f8f9d-4&algo_pvid=14ea6170-e624-4ec4-ab4e-da1f802f8f9d&priceBeautifyAB=0
Thoughts on these two frames?
--- End quote ---
I've never purchased from Aliexpress. The 258 shows 150 frames in stock?! A July delay would be dealbreaker for me. I know you're not the seller, but hoping to get info from anyone regarding what's shown on Aliexpress and what is reality for in stock.
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