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31.8mm bars and stems - do you run 'em?  RSS Feed

#1 2019-02-05 4:21pm

MickRich393
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From: Fukui, Japan
Registered: 2010-08-29
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31.8mm bars and stems - do you run 'em?

I know that quite a few riders made the switch to the larger diameter stems when Box first brought out the Maximus bars, but thought that their popularity had been waning in recent years. Then whilst looking at 31.8mm stems online, I noticed that Elevn recently released a new model:-

http://uploads.bmxmuseum.com/user-images/47558/elevn-overbite-stem5c5a26a95a.jpg

Presumably there must still be a market for them if Elevn have jumped on the bandwagon. That then got me thinking, how many of you actually run the 31.8mm set-up? If yes, why? If no, why not?

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#2 2019-02-05 5:35pm

brettweir89
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From: NW Indiana
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Re: 31.8mm bars and stems - do you run 'em?

I did the Box Maximus / Delta combo for awhile. I'm sure they were stiffer / stronger than I would ever be able to take advantage of. So, went back to traditional bars and stem which I personally find more aesthetically good looking and plenty strong enough for me.


So long as the paperwork is clean, you boys can do what you like out there. -Fifi McAffee (MFP)

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#3 2019-02-05 5:56pm

MickRich393
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Registered: 2010-08-29
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Re: 31.8mm bars and stems - do you run 'em?

Yeah, I saw you'd had those then sold them. big_smile

I'm in the same boat though my set-up has been on the bike since it was built up, so have stuck with them.

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#4 2019-02-05 7:46pm

Drawn
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From: Australia
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Re: 31.8mm bars and stems - do you run 'em?

Would assume like a lot of the tech, it had come over from the mountain bike world.
BMX seems to wait and see where they settle and then take advantage of that development without the 50 changes they make along the way.
Then over time it does take a while for it to take off properly and fully come into style.

Just look at disc brakes. They came out in early 2000s. (Still want to chase down a Norco Speed Metal Madill model)
They died off because they dragged and all it took was someone to hit your disc and suddenly you have resistance to fight against.
But they are now coming back into fashion.
Could be a similar scenario.

Personally I just run normal bars and stems, more options with heights and bends on bars along with stems either top load or front load.

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#5 2019-02-06 9:34am

ChaseDyno-Bmx
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Registered: 2018-12-25
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Re: 31.8mm bars and stems - do you run 'em?

I Feel The Same As Brett , I just didn’t like the Looks.

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#6 2019-02-09 8:47pm

MickRich393
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Re: 31.8mm bars and stems - do you run 'em?

Drawn wrote:

Would assume like a lot of the tech, it had come over from the mountain bike world. BMX seems to wait and see where they settle and then take advantage of that development without the 50 changes they make along the way. Then over time it does take a while for it to take off properly and fully come into style.

Just thinking aloud here, but given the greater variety and choice of 31.8mm mtb stems, would running one on a bmx be a big no-no? I ask since quite a few of the mtb stems look quite similar to front load bmx stems.

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#7 2019-02-10 1:18pm

Drawn
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From: Australia
Registered: 2016-10-15
Posts: 84
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Re: 31.8mm bars and stems - do you run 'em?

MickRich393 wrote:

Drawn wrote:

Would assume like a lot of the tech, it had come over from the mountain bike world. BMX seems to wait and see where they settle and then take advantage of that development without the 50 changes they make along the way. Then over time it does take a while for it to take off properly and fully come into style.

Just thinking aloud here, but given the greater variety and choice of 31.8mm mtb stems, would running one on a bmx be a big no-no? I ask since quite a few of the mtb stems look quite similar to front load bmx stems.

Only struggle might be finding the right length that you would want.
A lot of BMX stems for pros are in the 45-55mm range give or take.
MTB stems, aren't always in that length range.

If you find the right length you would like, then there should be no issue.
Just ensure they are also for 1 1/8 steerer tubes.

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#8 2019-02-12 2:58am

MickRich393
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From: Fukui, Japan
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Re: 31.8mm bars and stems - do you run 'em?

So out of curiosity I’ve been having a look at some shorter (40mm) mtb stems and these all get good reviews:-

1. Truvativ Hussefelt
http://uploads.bmxmuseum.com/user-images/47558/74a4db6f-5ad8-4eb4-aa3a-f7771ee68c735c62a3b857.jpeg

2. Truvativ Holzfeller
http://uploads.bmxmuseum.com/user-images/47558/da8afdec-53b1-42b9-b953-448173f846565c62a408f2.jpeg

3. Thomson Elite X4 -
http://uploads.bmxmuseum.com/user-images/47558/ded938a1-f2eb-4262-a020-b467539231d45c62a45141.jpeg

Last edited by MickRich393 (2019-02-12 4:28am)

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#9 2019-02-17 4:00am

MickRich393
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From: Fukui, Japan
Registered: 2010-08-29
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Re: 31.8mm bars and stems - do you run 'em?

Was out racing today and spotted an interesting stem up on the start hill. Closer inspection during lunchtime confirmed my initial suspicions - it was an mtb stem:-

http://uploads.bmxmuseum.com/user-images/47558/6ab7686c-3c26-40ef-9fa8-7a9dec162ad35c694a579d.jpeg

http://uploads.bmxmuseum.com/user-images/47558/d322be84-b2aa-4904-9797-2191081c392a5c694a6e04.jpeg

The amusingly-named but cool-looking Spank Industries Spike stem. 31.8mm with a 35mm reach, it’s smaller than I’m thinking of trying but I liked it.

Last edited by MickRich393 (2019-02-17 4:01am)

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#10 2019-02-17 6:08am

brettweir89
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From: NW Indiana
Registered: 2013-08-26
Posts: 766
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Re: 31.8mm bars and stems - do you run 'em?

Looks cool but too short. Steering would be twitchy as hell IMHO


So long as the paperwork is clean, you boys can do what you like out there. -Fifi McAffee (MFP)

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#11 2019-02-17 8:07am

blammo585
Pro MemberDyno Lover!
Registered: 2013-02-17
Posts: 2128

Re: 31.8mm bars and stems - do you run 'em?

Yeah that may only be good for an Expert or a Junior frame.

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#12 2019-02-17 4:39pm

MickRich393
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From: Fukui, Japan
Registered: 2010-08-29
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Re: 31.8mm bars and stems - do you run 'em?

The guy was a younger class rider on, I think, a pro-sized (DK) frame but in any case I wouldn’t go as small as 35mm. That said, I don’t think my original idea of changing from my current 53mm (Promax Impact) to a 48mm is going to make much of a difference. In my question of geometry thread IPD suggested going even smaller and I quite like the idea of a 40mm Truvativ Hussefelt, as pictured above! It’s looks beefy but is actually lighter than the Promax Impact (both the 53mm and 48mm versions) and won’t break the bank. If it’s too small then I should be able to sell it on as it seems to be a popular stem in the mtb world.

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#13 2019-02-19 4:12pm

MickRich393
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From: Fukui, Japan
Registered: 2010-08-29
Posts: 3753
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Re: 31.8mm bars and stems - do you run 'em?

Have also just seen this Race Face Respond with a 45mm reach:-

http://uploads.bmxmuseum.com/user-images/47558/race-face-respond-45mm5c6c9b3dce.jpg

Hmmm...

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#14 2019-02-20 4:31pm

MickRich393
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From: Fukui, Japan
Registered: 2010-08-29
Posts: 3753
Bikes: 8
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Re: 31.8mm bars and stems - do you run 'em?

Never knew that Profile had a 31.8mm stem - the Nova:-

http://uploads.bmxmuseum.com/user-images/47558/profile-nova-stem5c6df13c99.jpg

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#15 2019-02-27 1:10am

MickRich393
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From: Fukui, Japan
Registered: 2010-08-29
Posts: 3753
Bikes: 8
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Re: 31.8mm bars and stems - do you run 'em?

This looks like a fun(n) choice! wink

http://uploads.bmxmuseum.com/user-images/47558/funn-15c76541486.jpg

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#16 2019-03-27 6:15am

80srock
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From: SE Michigan
Registered: 2018-06-27
Posts: 150
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Re: 31.8mm bars and stems - do you run 'em?

Just remember,  A lot of these companies are owned by riders and are a lot smaller than you think, thus their websites are really not the best or most descriptive.  I've been spending HOURS AND HOURS on all the bmx racing parts websites and find a TON of discrepancies.  Ask any of the owners about really odd emails in the last 3 months; those are all from me lol.  Theres a lot of missing information on these sites and I find out about them in calls or emails, only to find out that even after my emails they still never updated their websites.  I find that most of these bmx parts are for kids not adults, and you never know it because no one ever puts it in their descriptions.  Well, unless you're a 100lbs adult then fine.  Just be careful on all these parts you're seeing because they DO have rider weight limits and they will NOT tell you about them, or the ONLY guy in the office that can answer that question isn't there that day...

Secondly, there is actually a ****ton of flex on the standard handlebar/stem combinations.  I was experimenting between aluminum bars, thinwall chromoly bars like Answers and Elevns, and what I consider slightly thicker walled race bars like S&M's race xlt's, and was surprised by all the flex at the tubing of the bars by the stem clamp area. All of my race bars have it and it was more than I thought.  On older quill stems the actual quill flexes a ton as well.  The fork's steerer tube flexes a lot less on threadless stem setups but there's still a touch of flex nonetheless.   Now if you're just a casual rider that races occasionally then fine, but if you're kind of serious this stuff makes a difference.
This is why for example Box's setup has the bars at 31.1 down by the clamping area before tapering off to the smaller outside diameter the more you go up the bar.  This makes a difference.  I've put my foot on a person's stem and pulled back hard to note the flex down by that area and it is a little stiffer.  As most of you already know a ton of energy is lost at the gate due to the parts individual flex adding up over the entire bike when you load up and start cranking. 
Just remember, if you're thinking of taking a non bmx part and using it for bmx racing it may not have been designed with our type of stresses that the road bike or mountain bike world is used to.  Their frames are WAY bigger and you sit different on them, thus the stress comes from different angles.  Plus we land harder than they do. 
Also, if you're comparing weights on say a stem for example, and all the stems you've run across are 10.4 ounces, but this new stem you found is 5 ounces even, it's probably for 10 years olds and the the people that run the website have no idea... TRUST ME.  lol.


Threadless isn't "old school", sorry lol.  Thank you Linn Kastan, Scott Breithaupt, Bob Haro, Eddie Fiola, Martin Aparijo, Kevin Hull, Jose Yanez, Matt Hoffman & the rest for leading the way & keeping the flame lit.  Without you guys we'd have nothing.

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