Chinese Carbon MTB Forums
News:
Happy Holidays!
See likes
See likes given/taken
| Post info | No. of Likes |
|---|---|
|
Re: Stumpjumper clone
I buy such frame in L size and white color from another aliexpress seller. Briefly: This is high modulus carbon frame like original SJ MY19. But... i kill tread on one rear bolt (M12 body and M11x1 tread) - make new from В95Т1 alloy on home lathe. Top eye shock M6x1 bolt was 90 degree champfer, but frame (as original) have 120 degree champfer... make new from В95Т1 alloy on home lathe. There is no holes for place hosings in middle tube (as in original manual), but SWAT hile is absent and all housing plased in bottom tube. I buy dropper OneUp v2 180mm. Frame have slight problem to place dropper more than 17cm, but i cut 1mm from diameter of dropper ass and get 22 cm! Original bolts have rubber seal, i simple print TPU seal on printer. Complect seat post clamp have ~40.5mm diameter instead 38.6mm, buy right item on aliexpress. Original flipchip have big size and you need mill additional space in yoke if you whant it. As i understand that tight flipchip block bottom eye frop any rotation. But default china yoke set in "XC" position - not bad choice. Geometry precisely mathed to info by aliexpress lots! But have no such geometries in linkage web base. See attached *.itx file for linkageX3 software. For this frame maximum drive chain about 32T, but pedal efficiency at this 90..80%, if you move gravity mass to front - efficiency increase. I think that 28T (or may be 26T oval) and 9..42T cog wery good variant - for 28T drive antisquat about 100..110%. Positives: $800 Nice look. Light weight (may be it good moment). Compatible with "old" common 210x55 shox - simple to find in sale section. Negatives: No SWAT! $( No frame guards (use 3d printer...) Decals above paint lyers. I use oraguard anti stone TPU film. Frame have very thin wall in BB link region - may be this is normal, but... October 19, 2021, 10:21:43 AM |
4 |
|
Re: Stumpjumper clone
20Nm for m12x1 tread - it is no so high value. You may set 5Nm and use threadlocker for save "soft aluminum". For example sketch of bottom link... December 01, 2021, 09:43:21 AM |
2 |
Re: Stumpjumper clone
So I took mine out for the second ride, and the Main pivot bolts came completely lose, upon further inspection the threading on the bolts that is suppose to catch is completely gone. Can any recommend where I can buy new bolts? As I cannot use the Specialized kit as I need right thread for the main pivot bolt and the Specialized kit comes with left thread.1) You can use a latheman neighbor to make all new bolts. 2) You can buy original kit and use a latheman neighbor to make only right main pivot bolt. 3) ...more expensive methods... December 20, 2021, 08:55:53 PM |
1 |
|
Re: Stumpjumper clone
After reading here about soft bolts ... I went through the threads in the frame with a tap and cut out tight bolts under the resulting thread ... All bolts make for 6mm key. Bolts in Front triangle without trough hole. Make a space for install some rubber seal. Main tread M12x1mm. January 05, 2022, 07:44:42 AM |
6 |
|
Re: Stumpjumper clone
Good. Ride on bad roads as train by rails. My height 185cm. In picture used oneUp v2 180mm dropper. But for me 210mm size also compatible.
May 16, 2022, 12:26:39 AM |
4 |
|
Re: Stumpjumper clone
This is "XC" mod. Fork xf mcqueen 140mm. Rear sag 15%. Front sag 25%. In sence i feel that 90% antisquat clearly. Very funny mod. If you whant - may use this frame as agressive XC.
May 22, 2022, 10:41:47 PM |
3 |
|
Re: BXT-MTB-117 150mm AM bike
1) Original washers have more space for lubrication and a larger diameter than the bearing. And on the original links there are grease fittings that fill this system with lubricant without the need for disassembly! It makes sense to realize this beauty if you have links with grooves for large washers. But Chinese links do not have grooves and there is no place for it either. Therefore, I decided to use simple washers with a thin dust gap filled with lubricant - it will not allow moisture to easily reach the balls. 2) I just have an extra shock absorber of this size lying around “under the sofa” for a long time. March 19, 2024, 02:42:40 AM |
1 |
|
Re: BXT-MTB-117 150mm AM bike
This is PETG for size checking. If I decide to move forward, I will print from PA-CF20. But what I see now makes me understand that petg does a good job - the plastic part can be made larger. For example: March 19, 2024, 08:29:12 PM |
1 |