MTB Tech Rumors and Innovation

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6/3/2025 4:14pm

Sram bought out ochain.

woah! hmmmm what will they do to it...

It would be real cool if it came stock on some builds, but knowing the bike industry, they would put it on bikes that don't need it just for the hype beasts out there. Integrated Dub cranks would be a plus too.

1
6/3/2025 4:58pm

Sram bought out ochain.

woah! hmmmm what will they do to it...

It would be real cool if it came stock on some builds, but knowing the bike industry, they would put it on bikes that don't need...

It would be real cool if it came stock on some builds, but knowing the bike industry, they would put it on bikes that don't need it just for the hype beasts out there. Integrated Dub cranks would be a plus too.

You can option it on the "new" Tyee

1
Evil96
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Portogruaro, VE IT
6/3/2025 5:18pm
Nobble wrote:

Really? All their warranty policy says is lifetime against manufacturing defects not wear and tear.

Yes, if it shows any wear you'll get a new one, so it's really not as painful as people think

3
ahleic09
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Location
Bend, OR US
6/3/2025 7:17pm Edited Date/Time 6/3/2025 7:18pm

Maybe I missed it on here: did anyone catch the spec announcement that MY26 Stumpjumpers will now be sold as stumpjumper evos with a 160 mm fork and piggies back genie shock?


If nothing else it seems like an interesting branding move so close to the release of the 15

9
nato
Posts
17
Joined
11/25/2022
Location
Christchurch NZ
6/3/2025 9:25pm
ahleic09 wrote:
Maybe I missed it on here: did anyone catch the spec announcement that MY26 Stumpjumpers will now be sold as stumpjumper evos with a 160 mm...

Maybe I missed it on here: did anyone catch the spec announcement that MY26 Stumpjumpers will now be sold as stumpjumper evos with a 160 mm fork and piggies back genie shock?


If nothing else it seems like an interesting branding move so close to the release of the 15

...but will they have cable ports for us poor people / those of us that prefer mechanical?

5
6/3/2025 9:32pm
Yeti just dropped it's second-ever e-bike, the new MTe. It's pretty much a smaller version of their 160e in many ways, and is equipped with TQ's...

Yeti just dropped it's second-ever e-bike, the new MTe. It's pretty much a smaller version of their 160e in many ways, and is equipped with TQ's new HPR 60 drive unit. Full details and review - https://www.vitalmtb.com/product/guide/e-bikes/yeti/mte-66241 

Yeti Details-3Yeti Details-21.jpg?VersionId=29s7DzD8mI7vXRbNGRUxavg.Yp3SbYeti Details-24.jpg?VersionId=bGQCp5nmVAz6jD0lP2OR8

Yeti Details-6 0.jpg?VersionId=xL8

Highlights

- 145mm rear wheel travel // 160mm fork (compatible with up to 180mm forks)
- Carbon frame enhanced with Vectran plies
- 29-inch wheels with mullet compatibility via a flip chip
- Sixfinity suspension design
- TQ HPR 60 Drive Unit
- 290Wh or 580Wh battery options
- Integrated removable battery
- Integrated top tube display
- Adjustable leverage rate
- 64-degree head tube angle
- 449mm chainstay length
- Internal cable routing
- 12X148 Boost rear spacing
- Sizes: S - XL
- 3 build kits
- MSRP: C2 Eagle 90 Transmission - $9,850 | T3 XO Transmission - $12,650 | T4 XX Transmission - $14,300
- Weight (M, T3 Build, no pedals): 45 lbs (20.4 kgs)

roost66 wrote:

Better have a bearing warranty for that price, 16 bearings. Bearing kit cost $220.  

Why? It's a $14,000 Yeti e-bike, if $220 for bearings is an issue then its not the bike for you to begin with. There's also bikes out there with half as many bearings that cost even more for a kit because of the stupid sizes they use.

It's crazy how people will complain about those kinds of costs but will happily destroy the XX1 groupset in 500k because they cheaped out on chain lube.....

25
6/3/2025 9:47pm
Why? It's a $14,000 Yeti e-bike, if $220 for bearings is an issue then its not the bike for you to begin with. There's also bikes...

Why? It's a $14,000 Yeti e-bike, if $220 for bearings is an issue then its not the bike for you to begin with. There's also bikes out there with half as many bearings that cost even more for a kit because of the stupid sizes they use.

It's crazy how people will complain about those kinds of costs but will happily destroy the XX1 groupset in 500k because they cheaped out on chain lube.....

What do you expect us to do? Lube our $100 chain like some sort of poor person?

35
Primoz
Posts
4554
Joined
8/1/2009
Location
SI
6/4/2025 12:46am

Regarding Sram's half-link chain, what are the pros and cons?

Pros:
-possibly (depending on overall shape) only one stamping tool vs. 2 separate tools of current chains (separate inner and outer links)
-no need for a narrow-wide chainring, all teeth can be same for full retention (triangular shape instead of rectangular)
-odd number of teeth
-'narrow-wide' retention performance even on the cassette, thus:
-shifting possible with full retention tooth shape (on the cassette)
-more uniform support on shifting ramps (every pin/roller part of the cahin can be used for shifting vs. outer links only of current situation)
-even finer length adjustment

Cons:
-no more quick-link?

Anything else? More wear was mentioned but I don't see how wear should be substantially different to more widespread, inner-outer link chains. Wear locations are the same.

3
6/4/2025 3:49am
Primoz wrote:
Regarding Sram's half-link chain, what are the pros and cons?Pros:-possibly (depending on overall shape) only one stamping tool vs. 2 separate tools of current chains (separate...

Regarding Sram's half-link chain, what are the pros and cons?

Pros:
-possibly (depending on overall shape) only one stamping tool vs. 2 separate tools of current chains (separate inner and outer links)
-no need for a narrow-wide chainring, all teeth can be same for full retention (triangular shape instead of rectangular)
-odd number of teeth
-'narrow-wide' retention performance even on the cassette, thus:
-shifting possible with full retention tooth shape (on the cassette)
-more uniform support on shifting ramps (every pin/roller part of the cahin can be used for shifting vs. outer links only of current situation)
-even finer length adjustment

Cons:
-no more quick-link?

Anything else? More wear was mentioned but I don't see how wear should be substantially different to more widespread, inner-outer link chains. Wear locations are the same.

Regarding wear, for some reason when using half link chains on my bmx bikes, it always seems like you end pulling your wheel further back fairly quickly... 

4
boozed
Posts
659
Joined
6/11/2019
Location
AU
6/4/2025 4:38am
Primoz wrote:
Regarding Sram's half-link chain, what are the pros and cons?Pros:-possibly (depending on overall shape) only one stamping tool vs. 2 separate tools of current chains (separate...

Regarding Sram's half-link chain, what are the pros and cons?

Pros:
-possibly (depending on overall shape) only one stamping tool vs. 2 separate tools of current chains (separate inner and outer links)
-no need for a narrow-wide chainring, all teeth can be same for full retention (triangular shape instead of rectangular)
-odd number of teeth
-'narrow-wide' retention performance even on the cassette, thus:
-shifting possible with full retention tooth shape (on the cassette)
-more uniform support on shifting ramps (every pin/roller part of the cahin can be used for shifting vs. outer links only of current situation)
-even finer length adjustment

Cons:
-no more quick-link?

Anything else? More wear was mentioned but I don't see how wear should be substantially different to more widespread, inner-outer link chains. Wear locations are the same.

Regarding wear, for some reason when using half link chains on my bmx bikes, it always seems like you end pulling your wheel further back fairly...

Regarding wear, for some reason when using half link chains on my bmx bikes, it always seems like you end pulling your wheel further back fairly quickly... 

As the bent side plates slightly straighten out, presumably?

If so, it also could cause excessive wear or binding of the rollers?

6
6/4/2025 5:04am
boozed wrote:

As the bent side plates slightly straighten out, presumably?

If so, it also could cause excessive wear or binding of the rollers?

That was my guess...

3
Jakub_G
Posts
353
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Location
SK
6/4/2025 6:32am
jonkranked wrote:

make it massive like bmx chains. 

Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the chains as part of manufacturing process could. Still wouldn't put one on my bike though.

3
dolface
Posts
1671
Joined
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Location
CA US
6/4/2025 6:56am
jonkranked wrote:

make it massive like bmx chains. 

Jakub_G wrote:
Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the...

Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the chains as part of manufacturing process could. Still wouldn't put one on my bike though.

AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The plates stay the same length.

(Or am I missing what you're gettting at?)

12
jonkranked
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Location
Norristown, PA US
6/4/2025 7:45am
jonkranked wrote:

make it massive like bmx chains. 

Jakub_G wrote:
Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the...

Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the chains as part of manufacturing process could. Still wouldn't put one on my bike though.

that was the joke, all the ways the wear is mitigated would render it non-useable for mtb.  maybe not for a gearbox. 

1
jonkranked
Posts
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Location
Norristown, PA US
6/4/2025 8:03am
jonkranked wrote:

make it massive like bmx chains. 

Jakub_G wrote:
Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the...

Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the chains as part of manufacturing process could. Still wouldn't put one on my bike though.

dolface wrote:
AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The...

AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The plates stay the same length.

(Or am I missing what you're gettting at?)

that's been my understanding too, is that its the rollers that wear / deform over time. 

1
Digit Bikes
Posts
180
Joined
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Location
Irvine, CA US
6/4/2025 8:07am Edited Date/Time 6/4/2025 8:27am
dolface wrote:
AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The...

AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The plates stay the same length.

(Or am I missing what you're gettting at?)

Perhaps they hope the half-link design can improve strength. The last two chains I’ve broken have been on the inner link.

I have a hunch these breaks are because electric derailleurs push harder than thumbs (I never broke a chain in this way with mechanical shifting). I imagine e-bikes are even more abusive than my puny wattage, e-bikes with electronic shifting might be a destructive combo.
image 31
image 30

7
Jakub_G
Posts
353
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8/7/2019
Location
SK
6/4/2025 8:15am
dolface wrote:
AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The...

AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The plates stay the same length.

(Or am I missing what you're gettting at?)

Classic chains don't, half link chains however do and they do so at fairly decent rate if you are putting enough wattage through them. And then they snap. Dreamy.

3
6/4/2025 8:15am
Jakub_G wrote:
Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the...

Not only that wouldnt work with narrow space between 12 speed cassettes but also wouldn't help with stretching issues. However I could see pre stretching the chains as part of manufacturing process could. Still wouldn't put one on my bike though.

dolface wrote:
AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The...

AFAIK chains don't actually stretch in any meaningful way, the rollers (and maybe the pins) wear allowing the rollers to sit off-center on the pins. The plates stay the same length.

(Or am I missing what you're gettting at?)

jonkranked wrote:

that's been my understanding too, is that its the rollers that wear / deform over time. 

Except when you compare a worn chain to a new chain length the worn chain is always longer, so there has to be some stretch occurring (in addition to rollers wearing out.)

2
7
sspomer
Posts
6090
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Location
Boise, ID US
6/4/2025 8:41am

PIT BITS video Leogang World Cup DH.

10
Digit Bikes
Posts
180
Joined
9/22/2021
Location
Irvine, CA US
6/4/2025 8:54am
Kapolczer wrote:
Except when you compare a worn chain to a new chain length the worn chain is always longer, so there has to be some stretch occurring...

Except when you compare a worn chain to a new chain length the worn chain is always longer, so there has to be some stretch occurring (in addition to rollers wearing out.)

Here's how roller wear manifests as elongation. Though it's perhaps inaccurate this elongation is colloquially referred to as 'stretch'. 

Extend the wear life of roller chains

38
Zero Cool
Posts
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Location
Bristol GB
6/4/2025 8:57am Edited Date/Time 6/4/2025 8:59am

Shimano XTR M9200 has been leaked on Reddit in all it’s wireless glory. I’m not posting a link as I assume it’s still embargoed but you will want the r/MTB sub. 

1
2
6/4/2025 8:57am
Kapolczer wrote:
Except when you compare a worn chain to a new chain length the worn chain is always longer, so there has to be some stretch occurring...

Except when you compare a worn chain to a new chain length the worn chain is always longer, so there has to be some stretch occurring (in addition to rollers wearing out.)

Here's how roller wear manifests as elongation. Though it's perhaps inaccurate this elongation is colloquially referred to as 'stretch'. 

Here's how roller wear manifests as elongation. Though it's perhaps inaccurate this elongation is colloquially referred to as 'stretch'. 

Extend the wear life of roller chains

I stand corrected, thanks @Digit Bikes!

5
6/4/2025 9:05am Edited Date/Time 6/4/2025 9:06am

After a 10 YEAR hiatus, Shimano is back in the electronic drivetrain space, this time without wires (thank god!). I've been riding the drivetrain and brakes since the beginning of December, 2024. Here's what I thought of everything - 

0:00 - Di2 History 
1:44 - Why it take 10 years to make new Di2? 
2:48 - Derailleur & Shifter Switch Details 
6:10 - New Crank Details 
6:52 - New Cassette Details 
7:27 - Derailleur Clutch and Design 
12:04 - New XTR Brake Details 
16:48 - Brake Lever Setup 18:36 - Shifter Switch Setup 
22:21 - 150 Mile Test - Initial Impressions 
33:39 - Final Thoughts - 6 Month Test 
34:30 - XTR Brake Performance 
40:20 - Shift Performance 
42:46 - Component Wear 
46:11 - Is it Loud?? 
48:08 - Weight and Price Breakdown 
48:58 - The Bottom Line on XTR Di2

16
Jakub_G
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SK
6/4/2025 9:19am

Xtr bits already released on the other website, have to say they went to town with the pricing 😂 I will keep my 10speed, thanks.

1
1
seanfisseli
Posts
567
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4/16/2024
Location
Santa Cruz, CA US
6/4/2025 9:26am

Anyone want to take a shot at explaining the lack of a clutch on the new shimano stuff?

5
3
sspomer
Posts
6090
Joined
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Location
Boise, ID US
6/4/2025 9:27am

Anyone want to take a shot at explaining the lack of a clutch on the new shimano stuff?

watch the video. it's literally explained in detail.

19
3
6/4/2025 9:31am
Jakub_G wrote:

Xtr bits already released on the other website, have to say they went to town with the pricing 😂 I will keep my 10speed, thanks.

It's the 5th in Japan embargo lifted today

2
Kusa
Posts
277
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6/25/2010
Location
CH
6/4/2025 9:38am
Jakub_G wrote:

Xtr bits already released on the other website, have to say they went to town with the pricing 😂 I will keep my 10speed, thanks.

Not the first comment like yours. Did people expect that top of the line wireless system will be around Sram GX? I don't get it...

10
jgaube
Posts
14
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Location
Denver, CO US
6/4/2025 9:52am
ahleic09 wrote:
Maybe I missed it on here: did anyone catch the spec announcement that MY26 Stumpjumpers will now be sold as stumpjumper evos with a 160 mm...

Maybe I missed it on here: did anyone catch the spec announcement that MY26 Stumpjumpers will now be sold as stumpjumper evos with a 160 mm fork and piggies back genie shock?


If nothing else it seems like an interesting branding move so close to the release of the 15

Where did you see this at?  I’ve got one with standard Genie and considering upgrading. 

1
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