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Messages - gohloum

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121
29er / Re: My first MTB Build know nothing need advice
« on: September 17, 2016, 05:26:15 PM »
First off, great choice on your frame. I bought the exact same one, but it won't ship until Peter is back from Interbike on the 27th.

Secondly,  Components.  Nothing wrong with Deore XT, but you might want to check into SRAM. It will cost a little more, but after I had a chance to ride a few SRAM bikes, I was sold on the shifting and craftsmanship.  If you go to the components thread, you will see one I posted asking comparison between Deore XT and SRAM.  Everyone who answered gave great feedback and I have managed to pick out my groupset.

Your fork.  If it's in your budget and you plan to ride hard at all, get the best fork you can get your hands on.  It's hard to justify a $900 upgrade when you already spent close to $500. If you can, just shell it out now. You will be happier in the end if you ride much at all. Fork performance makes so much difference in the ride you don't want to sacrifice here if possible. Keeping your front wheel in contact with the ground is ever so important on a hardtail. As for brands, I'm only familiar with Fox and Rock Shox.  IMO, the Fox Factory 32 series is going to be a little more responsive and supple, but Rock Shox is a little lower maintenance. However, Fox redesigned their air spring system for the 2016 and 2017 models which is supposed to also help reduce maintenance from the previous versions. Either way, go high end here if you can spare the coin.  I did. I ordered the Factory 32 Step Cast for mine this past Wednesday.

Now for the Giant bike.  Looks like a 24" wheel, correct?   If so Suntour has some forks that will fit it. I don't recall the models, but the bottom one is crap.  You will want to go min 1 level up.  I was looking for a bike for my son over the summer at my LBS.  There were 2 used Treks in there. One was a 2014 and another 2015.  The 2015 had the nicer fork. Even nicer than the new 2016.  It wasn't buttery supple, but it was pretty smooth and adjustable.  I think new they are around $200 give or take. 

For his components, def go shimano.  Just make sure that you stay in the same gear setup or you might have freehub body issues.  If you know how to adjust and axle for hub alignment and dish a wheel, then no biggie. It's hard to tell from the pic, but it looks like the BB is possibly a BSA 68/73. This would be a threaded BB. Grab a metric ruler and measure the length of the BB tube from left to right under the bike. If you are exactly 68 or 73mm (not including the cup flanges), chances are that's what you have.  It's one of the most common standards and easy to find parts for. You can probably find a standard Deore (M615 I think) groupset pretty cheap.  However, I think they are 10 speed.  A lot of the Jr bikes are 7 or 8 speed rear.  If his is an 8 or more, you may be able to go with a 10 as the cogs are closer together and 8-10 fit on the same free hub body. 

Have fun with your new ride.  Post pics too.  It will be nice to have a few more riders on the MB01 in here as well.  :-)

122
29er / Re: 45 or 51mm fork rake for CS-MB01
« on: September 17, 2016, 04:52:50 PM »
Thought I'd give a quick update here. 

My LBS guy called fox to order my shock. I wanted the orange and the 51mm is only in black.  This time he spoke with a guy who actually knew in much greater detail about the rake issue.  Now although my nutty explanation above makes sense, we did find out a bit more.  The 51mm is geared more towards the trail rider.  the 44 is XC, and the "Did you see all the forks in the field in the Olympics?" comment came up.  Pretty much everyone on a Step Cast was running an orange one (44mm only).  If I recall, I think Emily Batty was running one on her hardtail (Trek). 

So, that being noted, I'm going with the 44.  It's already been ordered and I think Fox said about 3 days to finish up a run before they can ship. 

123
Component Deals & Selection / Re: What is Deore XT to SRAM equivalent?
« on: September 17, 2016, 04:42:52 PM »
Just want to say all you guys kick butt! I've been posting pretty heavy in here the past few weeks, and its been great to get so many answers from all of you.

So yeah, I think after much research and comments from this thread, I am able to go SRAM after all.  I'm just waiting on feedback from Box Components to verify if their shifter and derailleur are SRAM compatible.  I've seen some posts on the web that say they are, but on the box site, it says just Shimano.

If I can scrape up the extra $80 or so, I will get those 2 components.  Other than that, I can only go Gx for all the components except an X1 shifter.  I don't want to spend a lot on the crank because I'd rather get something I really want in 6 months.  Gx gets me on the trails and upgrades won't seem to hurt so bad. :-)

124
Component Deals & Selection / iFX Aluminum crankset from Aliexpress
« on: September 16, 2016, 10:54:11 PM »
These are really cheap, but does anyone know anything about them?  I need to replace cranks on an older bike.  This will fit the BSA 68mm.   Just curious if anyone has tried them. Looks a lot like a Shimano knockoff.

http://www.aliexpress.com/item/104BCD-alloy-aluminum-road-mountain-bike-crank-suit-sprocket-set-68BB-folding-bike-refitting-for-XT/32705441321.html?spm=2114.13010208.99999999.266.PcOYoj

125
Component Deals & Selection / Re: Novatec D771 / D772
« on: September 16, 2016, 12:09:45 PM »
I have some wheels ordered with Novatec.  I got 29er with 25x30 rims for my first set.  I'll probably get some DT swiss for the next set, or build my own with something boutique after the new year. 

I probably won't have the bike built until first of October, but once I do I will definitely give some reports.   Water, sand and mud are going to be real tests for me here, I'm in Southwest Florida and we've had twice the rainfall this year.  It will be interesting to see how often these hubs will need work.

126
29er / Re: 45 or 51mm fork rake for CS-MB01
« on: September 14, 2016, 10:54:37 PM »
That's very interesting about your Epic.

I'm getting my fork through a local guy who sells a lot of Fox forks.  He called them up to find out more about the SC since he hadn't sold one of those yet.  The Fox Factory guy told him that all the high end Treks are specifically 51mm because of the geometry.  He said that a lot of it has to do with head tube angle, but other geometry plays a factor in contribution, like wheelbase, chain stays, etc...

I'm from the old school days and I remember when rigid forks on most bikes were bent where the rake was more obvious. and if you ever did silly stuff like try and turn the handle bar around backwards and ride no-handed, you were in for a quick surprise kiss with the pavement as the rake prevented the ability for the wheel to track.  the physics are similar to dihedral in an airplane wing.  Stunt planes have little to no degree of dihedral to prevent them from trying to roll back over when inverted, where as jumbo jets have much greater angle.  That force is is similar to pressure applied from the weight of the rider.  The rake has kicked the axle positive of the centerline of the head tube vector. Therefore Delta (D), being the direct straight line from axle to bottom headset crown (connecting pivot point) which creates a weighted mass between the 2 angles, (similar to the center of gravity in a dihedral wing) applying force to F (gravity). 

In an airplane, it's obvious to observe and understand, the wings are equal length and F is down (gravity).  In a bike, force from the rider is down, but the force (F) applied to the rake if forward.  The 'dihedral' type concept is harder to observe because the angle is offset and between the head tube vector and rake vector (it looks lopsided).  However, if you hold your bike up by the top tube in a wheelie where the head tube is parallel to the ground, what happens to your front tire?  It tries to turn around backwards.  The more rake offset, the greater the force an faster it will come around once it breaks 0 degrees, which is similar in principle of greater angle of dihedral rolling a plane back upright.

[Sorry about that long explanation, I program games and have to do a bit of physics and math simulations from time to time.] :o

I remember this in action: The guy I worked for in his bike shop back in the 80's would weld up custom kits, and we got to play with frame geometry and experiment a little... (and burned up all kinds of stuff around the shop with his torch and welder). I do remember we built a custom fork for my Haro Master BMX bike.  I was getting into riding half pipe more than street freestyle and the master was super twitchy compared to the other model they made (forgot the name).  I believe what he did was increase the rake on the fork he built for me. It made the bike track better when riding with no hands, and definitely took some of the twitch out on landings,  I was not the most graceful half pipe rider.

127
29er / Re: CS-MB01 ordered... It has begun!!!!!!!
« on: September 14, 2016, 10:11:49 PM »
I'm in Southwest Florida, so I really don't need full suspension for 90% of my riding.

I do see them on the trails, but most of the time its super old dudes with grey hair with super high-end name brand bikes, lycra 2 sizes too small, riding slow, and GoPro cameras stuck all over them and their bikes like leeches.   I don't qualify for that club just yet...  ;D

... Although a GoPro might be kinda fun...

128
29er / Re: CS-MB01 ordered... It has begun!!!!!!!
« on: September 14, 2016, 03:25:24 PM »
Absolutely!  I did a search in the forum about this frame.  All you guys talking and speculating, but no one gave any feedback.  Peter sent me that same pic of the rigid bike built up. He even sent me the owner's email, but I didn't get any response. 

I figured I'd do all you guys a good solid and be the the test pilot for this one.  8)

The more feedback each of us can give on our frames, but better we can help others on making a good purchase decision.

I read this article about hard tails and one of the topics was the BMC Teamlite which has a removable insert in the seat stays.  However theirs gives about 15mm of rear wheel travel and the inserts can be changed out for different stiffness settings.

Seeing how this bike only comes built with XTR currently an is WAAAAAAY beyond my budget, I found the idea of modified seat stays interesting.  I'm sure it's not going to work anything like the BMC, but if it takes a little bit of jar out of the ride, I'm all good.

Article: http://marathonmtb.com/2015/08/10/why-the-hardtail-isnt-dead/

129
29er / CS-MB01 ordered... It has begun!!!!!!!
« on: September 14, 2016, 12:16:26 PM »
Well, I pulled the trigger on this frame, wheels, bar, and seat post from Peter @ xmcarbonspeed.com.  Due to the Chinese holiday and the fact that Peter is headed to Interbike in Las Vegas on the 18th,  Some stuff is shipping before, but the wheels have to be built and wont ship until later.  No big deal though... We have had sooooo much rain here all the trails are flooded.

So here is what I have for specs.  Pretty sure I found a SRAM solution I can afford.

Frame CS-MB01 (carbonspeed)
Flat Bar B7 (carbonspeed)
Seat Post SP7 (carbonspeed)
Wheelset (carbonspeed)
Rims: YHR930C rims 32/32H UD matt :  http://www.xmcarbonspeed.com/Productinfo.asp?f=1428
Hubs: Novatec D771/D772 hubs 32/32H for 100x15/142x12
Spokes: Sapim D-Light spokes
Nipples: Sapim self-securing nipples

Fork: Fox Float 32 Factory SC (Step Cast) No remote.
Stem: Origin8 (from amazon)
Pedals: Shimano 737 Vintage (on my current bike).
Saddle: Carbon GUP 1153
Tires: Specialized Ground Control 2.3
Grips: Probably RaceFace Half Nelsons

Crankset: SRAM GX 175mm 34 tooth
Chain: SRAM
Trigger Shifter: SRAM x1 11 speed
Cassette: SRAM GX level
Derailleur: SRAM GX

Normally, I'd be going crazy waiting on everything to come in, but with the excessive rain, it's not that fun to ride now anyway so it's all good.

I'll add pics and send details as components arrive.  ;D


130
29er / 45 or 51mm fork rake for CS-MB01
« on: September 13, 2016, 03:36:08 PM »
So I pulled the trigger today on this frame, wheels and other goodies from Peter.  I am planning to go with the Fox 32 Factory SC fork.  However, I am not sure which would be the appropriate rake for this fork. 

As a rider, I'm a between sizer for frame so I went with the 17".  I am wondering since the head tube angle is 71, if I should go with the 51?  Seems Trek Genesis 2 geometry call for the 51 as standard. 

Any thoughts on this?

[EDIT Title]
Oops,  I meant to type 45 instead of 49.

However, after much research, I have come to the conclusion that the 51mm in most cases will be the better option for most frames with steeper head tube angles.  Generally greater than 69.5.  However as all of you know, the full geometry plays into the ride and twitch, so it becomes a bigger conversation.... Kinda like crank arm length, especially if you look at mtbr.com.  It really comes back to more rider experience and trial and error.



131
29er / Re: Works Well Bikes or Work Swell Bikes WCB-M-124
« on: September 12, 2016, 11:47:17 AM »
I don't know much about that frame, but from what I have learned reading in this forum for the past couple of weeks, WorksWell is a good vendor.  I believe Peter at xmcarbonspeed seems to be the favored.  In the pricing I have gotten, he seems to be a little more expensive, but service reports back are quite positive.  You should browse the Vendors section of this forum.  Lots of people have posted their experiences...

132
29er / Re: Scott Scale frame vs Chinese frame
« on: September 12, 2016, 01:12:17 AM »
Interestingly, I just read in one of these threads talk about comparison of 1 frame to a Stumpjumper and the other to the Scott.  I thought it was near the end of the sticky thread for bike pics.

Regardless, I think xmcarbonspeed has one. it's either them or WorksWellBikes.  Good thing is both companies have geometry posted, so if you know what you are looking for, you should be able to find it.

Hopefully, on of the more knowledgable guys will chime in and answer it.  If I come across the thread again, I will post it here.

133
29er / Re: 29er Frame sizing question
« on: September 12, 2016, 12:50:13 AM »
Yeah,  I was looking at the 062, which has 18.5 size.  I kinda got all into the idea of the vibration relief of the other frame... Then I decided to get a price from WW.  Geesh! The frame is more than $120 cheaper!  Also a set of wheels speced with same hubs is $100 cheaper.  Shipping, $30 cheaper.

So if it wasn't the sizing issue, now my wallet just got involved. :o

Decisions, decisions....

134
Just a quick question on this.

So I've decide to go Shimano due to pricing, and I found a set with the crank mentioned in the subject which is a 148 Boost from what I understand.  I did a bit of research and found the hubs I have chosen are the D772 which is not boost.  After reading a few articles, I would seem that what I will need to do to properly align my crank ring, which is as simple as installing spacers to offset the ring.  I found this information on the following page: http://www.oneupcomponents.com/pages/understanding-chainline-for-optimal-1x-conversions-boost-and-non-boost

Is this correct or do I need to be concerned about compatibility issues?

[UPDATE]
Never mind,  I figured this issue out.  Boost hubs are in the new 148mm standard axle.  The frame I'm ordering on Tuesday is 142, so it's not an issue.  The component group has the ability to upgrade, but it's actually a standard config, not boost.  So I am all good. 

135
29er / Re: 29er Frame sizing question
« on: September 11, 2016, 01:11:44 PM »
So I went checked out a few bikes.   a 19" Specialized RockHopper comp 29er is too big.  I'll smash my jiblets for sure on the top tube.   On a Trek Procaliber, the 18.5 fit and I had good clearance, maybe a little stretched out, but hard to tell because I was higher off the ground... Definitely a 'Bigger' sensation.  The 19.5" was too big. I'd be afraid to hit anything very technical with it. 

A Trek Marlin is what I could find in a 17.5".  I could ride this one as well, but it had a short stem and riser bars which made it feel a little more compact.  Also the Marlin is a trail bike like the Rockhopper vs XC like the Procaliber.

So I am thinking a 17" is going to better, especially comparing stack with some of these bikes.  Trek's were pretty low, and I think that was one of the major problems with the Rockhopper. 

It's just sucks that I can't ride a CS-MB01 from xmCarbonSpeed before I buy.

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