Chinese Carbon MTB > 26er & 27.5 (650b)

BXT MTB-036

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emu26:
Anyone familiar with BXT or this frame BXT MTB-036?  https://www.aliexpress.com/item/2018-NEW-BXT-full-carbon-mtb-frame-27-5er-cadre-carbone-t800-carbon-Mountain-bike-frame/32839894647.html?spm=2114.search0604.3.11.284e50bcV7uSdp&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_10130_10547_319_317_10548_10696_453_10084_454_10083_433_10618_431_10307_537_536_10131_10902_10132_10133_10882_10059_10884_10887_100031_321_322_10103,searchweb201603_51,ppcSwitch_0&algo_expid=65594ce4-d74e-4021-bfdc-22be8fd574a9-1&algo_pvid=65594ce4-d74e-4021-bfdc-22be8fd574a9&transAbTest=ae803_4

Anyone recognise it as another frame?

emu26:
Frame arrived yesterday, not bad considering it was ordered on Sunday 27th Jan and arrived on 4th of Feb. Pretty good considering this is Chinese New Year week.

The good
- general finish is fantastic, not a blemish with the exception of the BB hatch, see below.
- the BB that came "free" with the frame feels really nice, very smooth, looks like it is sealed well, it's 24 / 24 internal ID but comes with both spacers and also a 1mm collar to reduce non-drive side to SRAM GXP compatible. Finish is plain but very good. Those cranks have now been ordered.
- bb shell and headset race all look smooth

Needs work
- Nothing major but they have crossed internal cable guides so I'll have to play around with this a little bit to get it back to the way I like to set them up.
- The thru axle that came with the frame is not quick release. Not a huge issue, it is the same as one of the axles pictured on the add but the add also says QR and does have a second pic that shows a QR axle. I will contact them and see what they say.

The bad
- The finish on the removable hatch at the bb that allows access to the internal cable guides isn't "perfect". Certainly not enough to worry about but given how good the rest of the frame looks it's a shame it's not better.
- The weight. Not a huge deal here, this is a budget build so whilst I want to keep weight down as much as possible for the boy it was never going to be a "race light" bike. This may be an issue for others though. Claimed weight 1100 +- 50gm for 18", this 15.5" weighs 1274gm with drop out, thru axle and spacer. I'll check the weight of those items before I build.

So far, on initial quick look, very happy with a frame that only cost $320A ($230US) delivered.

Pics https://forums.mtbr.com/off-camber-off-topic/occ-bike-thread-v14-1010286-133.html#post13974687

ldavies:
That is a great price for the frame but shame about the misleading advertising on the weight.

Please post pics when you are done with the build. 

I have a couple of questions:
1)Is the seat tube internal diameter as advertised?
2) Does a correctly sized seat post fit smoothly into the frame or is it loose or the opposite - too tight?

Thanks much,  Lloyd

emu26:
Hi mate, sorry for the slow response. Yes I got this frame. Overall pretty happy with it. Only 2 things from a quality point of view, I can't get the supplied headset to seat so that the cover disk sits all the way down to the frame. There is a very small gap, less than 1mm so I'll need to keep a close eye on the bearings to make sure they stay well lubed. The little removable cover plate under the bottom bracket has a circular recess in it so the retaining bolt sits down, not proud of the frame where it might get hit. It then has a small flange in the cf that the bolt sits against, when they have drilled out the hole for the bolt to go through some of this flange has been removed as well. I contacted them about it and they got straight back to me asking for photos. I don't think they understood what I was talking about. I haven't done anything further with it yet as it seems to be holding well.

As for seat posts I got this one  https://www.ebay.com.au/itm/Seat-Post-Pillar-CNC-Aluminium-31-6mm-x-350mm-GUB-G-0316-Red/381238474451?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649  It was a firm fit in the seat tube and went most of the way down to the bottom bracket. I ended up cutting some off the end of the post to get the correct saddle height and installed it with some carbon paste which made it a firm fit.  He's had a couple of rides on it so far without issue.  Note the size of the seat collar though, I couldn't find one to suit so ended up using the one that came with the frame.

Build itself was incredibly frustrating but that was because I was on a budget and was in the hands of fleabay and Aliexpress sellers.  Build itself once I had the parts was fine, no major issues.  Bike could easily be built up sub 10kg on a budget, this will be there when I go tubeless. Coming from a 14.5 kg Giant he is absolutely stoked with it, and that is the most important thing.  It has been raining here pretty much since the day I finished the build so we haven't been on any great off road rides yet but so far so good.

emu26:
Oops, just saw my earlier reply, forgot I had posted that so doubled up a bit with that last post.

One thing to clarify, I initially said the rear axle wasn't quick release, I now know how to use it and it is tool free quick release. The retaining washer / nut on the drive side just sits in a recess in the dropout so when you remove the axle this nut will also just fall out. Have to keep an eye on it to make sure it doesn't get lost doing trail side repairs.

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