Chinertown
Chinese Carbon MTB => 29er => Topic started by: charlesrg on June 28, 2018, 01:26:20 PM
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Just finished building yesterday. Got it to 10.3kg / 22.71 lbs. To make it sub 10Kg I could save 100grams in a race saddle and 250 grams on lighter wheels with DT240s.
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Which frame?
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Parts list? Super impressive 22lbs!
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Frame is the Pro-Mance T800 M7007.
XX1 11 speed cassete and derraileur and chain
XX1 Eagle Dub crankset
Shimano XT brakes (M785)
Rockshox Monarch XX shock
Rockshox SID World Cub Fork
XMI Wheels (DT240S rear, Bitex Front)
Maxxis IKON 2.35 Front and Back.
Shimano XTR Pedals
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Took a picture today
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Took a picture today
Is that color YS7337?
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It’s turquoise. I gave them the Pantone for turquoise and that’s what came out.
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Guys, the final build has a play on the shocks eyelets. I'm using RWC needle bearings and even with the ++ inner ring, the bolt is loose. Wondering if you guys have any suggestion.
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Play in which direction? I have a little play on my M06 but it's in the aluminum rocker for the rear shock. The bolt holes are just a tad too big so the thru bolt has a touch of play. Doesn't effect the performance at all. Not much i can do to correct it other than custom make a proper diameter bolt to match the rocker then hone out the shock to accept the larger diameter bolt. Way too much work work for no gain.
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Here is a video showing the play:
https://youtu.be/OwKBvhs9S34
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Very difficult to see but it appears the play is in the hole of the shock itself? It looks as though the rocker is one with the bolt. That's different from what I am experiencing. The only solution I see is to install a bronze bushing in the shock eyelet then hone it out to proper size. If your shock is not machined for a bushing then you would have to perform that. Not the easiest thing in the world to do. You need the right tools. It's totally doable though ???
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Oh wait, then again you're using a RWC bearing kit so if the play is between the bolt and the bearing, there's nothing you can do there. Can't get a custom bearing with a custom inside diameter. You would be stuck trying to make a custom diameter bolt like what I need to fit tighter.
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I just made a new video showing the play in between the bearing internal and the suspension bolt.
https://youtu.be/09sZjBuueRU
I tried already using the - , + and ++ bearing inner part but there is still play.
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I'm going to state the obvious. Either the RWC inner ring is not within spec or the suspension bolt isn't. A digital caliper should be able to tell you which one. Based on your video it is defiantly too much play. I have the same RWC bearing kit, and a suspension bolt (8mm) from a new HongFu FM258 frame. Zero play.
From my understanding the different RWC inner ring sizes(-,+,++) have to do with the outside diameter, not the inner. The inner diameter is the same for all inner rings. The most likely culprit is the suspension bolt, since you are getting play in all the inner rings.
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This is what Sissypants wrote in his thread about the Pro-Mance frame. Could it be the same issue here?
"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."
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Regarding the play. I have the same problem. But I am thinking it might be due to using 21.8 sleeve length. Pro-Mance have specified 22.4.
With the bolt length 40mm and sleeve length 21.8 the sleeve will not press against the frame with the bolt fully tightened.
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When I received it, I measured 22.2 bottom and 21.8 top, on my fm058, and bought rwc hardware to suit.
As you have found with the too-long bolt issue, my top bolt would bottom out before it tightened on the frame. The best solution would be to get a slightly shorter bolt, but I didn't have one at hand, so put some washers in there to make it work. Seems to have worked ok since I did this (about 9 months ago). I suspect that perhaps the frame designer intended that we should put 22.2 hardware in that top mount, and then spread the rockers slightly to make it fit - then the stock shock bolt might work.
The play referred to above is a separate issue, where the outer diameter of the stock shock bolt is a tiny bit too small. My bike has this issue, but it is very very subtle. So subtle that it was very hard to find. I certainly couldn't see any movement. It doesn't seem to be getting any worse, so I am in no hurry to fix it. I have intended to replace the bolts with something lighter at some stage.