26.0 bar in 25.4 clamp?

[Chasen Smith]

how do you all make this happen? 

i have only successfully done it once and the toll was high- huge and noticeable cosmetic damage to the nitto dirt drop stem and to the sleeveish clamp bar of nitto noodle bars.

basically i wanna run a 25.4 technomic stem with some wide nitto drops, without fudging up either too badly. i have noticed that while noodles have a sleeve and crust bars in 26.0 have more of a ramp, does this make a difference?  

[Anthony Coffin]

I'm guessing the only safe way to do this is to change the size of the hole. Even if you can get the 26 bars on a 25.4 stem you end up compromising the integrity of both pieces, no?

[Victor Hanson]

Not that much.  The sleeve helps with installation on centering the bar.  More importantly - don't forget to use some manner of interface whether it be Pedros carbon paste or lubriplate 105.

VTW 

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VIctor R. Hanson

Gen Mgr

Schmier Industrial Properties

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[Frank Brose]

In a situation like this I either buy a different stem or buy a different bar. If it's visa versa with a 26 stem and a 25.4 bar you can use a shim but what you propose isn't meant to be.

Frank

On Monday, July 24, 2023 at 3:05:02 PM UTC-5 chasenl...@gmail.com wrote:

[Garth]

Even "if" you bored out the stem, or shaved the bar,  it would be a bad idea as the amount of alloy there is there for a very good reason., so neither break.  Just trying to jam it is just as bad as then you damage both trying, then you have to buy a new bar AND stem. Just do the right thing from the beginning and buy a another stem.

[Chasen Smith]

https://youtu.be/z6-CdUeGAlk

Ole Ronny discussing this very matter at the 16:00 mark! Ha

On Mon, Jul 24, 2023 at 6:08 PM Garth <gart...@gmail.com> wrote:

Even "if" you bored out the stem, or shaved the bar,  it would be a bad idea as the amount of alloy there is there for a very good reason., so neither break.  Just trying to jam it is just as bad as then you damage both trying, then you have to buy a new bar AND stem. Just do the right thing from the beginning and buy a another stem.

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[Garth]

All that is presented in that video is bar in a stem, not how it was done. I see lots of stupid YT videos like that, 30 seconds of sizzle(look what I did Ma !) and no steak(the how) to be seen anywhere. "All you gotta do is pry it open" ..... well no $hit Sherlock. Show me the money, baby !

[Joe Bernard]

I did it once decades ago and it's a bad idea. Even if you can pry that sucker open enough - risking structural weakening - you'll have the most scraped up bar you've ever scraped. 

[Nick Payne]

I'd use an adjustable reamer to ream the stem from 25.4 to 26.0. I did this back in the 1980s when I wanted to use 26.4 Cinelli bars in a Nitto Technomic stem. The adjustable reamer I have for seat tubes has enough adjustment (down to 23.75) to be used for stems as well.

You can get cheap adjustable reamers off Aliexpress for less than $10. No idea of the quality (probably crap), but they should last long enough to do the job you need on an aluminium stem.

Nick Payne

[Laing Conley]

Personally, I would just buy the correct stem.

If you do want to modify the stem you already have, I would use a brake cylinder hone, generally available at local auto parts stores, Open it up as little as possible, leave as much metal as possible. You can also use a stem spreader (or snap ring spreader) to avoid damage to the bars. You can als fabricate a spreader from a nut, bolt, washer, and coin.

Again, for the price of the tools and selling the stem you have, you can get the correct stem which is what I would recommend. Aluminum is not as forgiving as steel.

Laing

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[Peter Adler]

Not to pile on here, but reaming out the clamp area of this stem (or really, of any stem) sounds like a Very Unwise Idea. If you compare the thickness of the handlebar clamps of a 26.0 Nitto stem and a 25.4 Nitto stem, you'll see that the metal is the same thickness. You think maybe Nitto knows what they're doing? You think maybe the reason they're not reaming bigger bores in the clamps for 26.0 stems is because all that metal they forge in is necessary for safety?

Modifying a stem that's only available in a single clamp size is problematic, but conceptually understandable; that's why Nitto makes shims to fit 25.4/26.0 bars into 26.0/31.8 stems. But the Nitto Technomic is not a one-clamp-only stem. Nitto has already made hundreds of thousands of stems that are sized exactly right for your need. Doctoring a Technomic is a pointless effort; it's also penny wise and pound foolish. Both 25.4 and 26.0 Technomics are common as dirt (the successor Talluxes are somewhat less so); this eBay search brings up 60 examples in various reaches from $40-65 shipped. What are your teeth worth to you?

Me, I buy my Nitto stems at swap meets. I've had four or five Technomics in both 25.4 and 26.0 over the years; I don't think I've ever paid more than fifteen bucks for any of them. At least three of my current stable are using such recycled stems now.

Here's a thought: Why don't you just post a want-to-buy for the stem you need right here (include both clamp size and reach, which you haven't mentioned at all), and see what shakes out? Your unshattered bones and unshredded flesh will thank you.

Peter "my body feels sharp, localized pain just reading this thread" Adler

Berkeley, CA/USA

[Nick Payne]

On Thursday, 27 July 2023 at 3:16:42 pm UTC+10 divis...@gmail.com wrote:

Not to pile on here, but reaming out the clamp area of this stem (or really, of any stem) sounds like a Very Unwise Idea.

Really? I just measured a Nitto stem as having a clmap area 32mm wide with the thickest middle section being 5mm. Removing 0.2mm or 0.3mm from that is inconsequential. Compare the amount of metal there with what's in a modern threadless stem. Here's the Syntace stem on another of my bikes. The front of the clamp is four small strips of metal 5mm deep that taper from 3mm wide where they contact the bar to 1.5mm wide at the front.

I've reamed multiple stems and never had a problem. The Nitto stem which I reamed to 26.4 for Cinelli bars has been in use on our tandem for over 35 years, and several others have been in use for two decades or longer.

Nick Payne