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keepin' it rural
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Okay, I may be losing my mind, but I have a 2020 MT and when I was demoing bikes I had google doc that I recorded every bikes geometry numbers so I could compare. For the MT I had the headtube angles for both Trail and Gravity modes as 65/64.5 respectively. I was just on the GG site and they have them listed as 64.5/64? Have they changed or am I just mistaken? I swear I had written them down correctly. 馃え
Bicycle Wheel Tire Land vehicle Bicycle wheel
 

always licking the glass
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Okay, I may be losing my mind, but I have a 2020 MT and when I was demoing bikes I had google doc that I recorded every bikes geometry numbers so I could compare. For the MT I had the headtube angles for both Trail and Gravity modes as 65/64.5 respectively. I was just on the GG site and they have them listed as 64.5/64? Have they changed or am I just mistaken? I swear I had written them down correctly.
You did write them down correctly. That was something i looked at when i first got my revved megatrails.

Can you email GG and see what they say? I鈥檓 curious myself.
 

keepin' it rural
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Discussion Starter · #4 ·
I knew I wasn't crazy here is a page from the MT owners manual I downloaded when I bought my bike. I sent an email so hopefully GG can shed some light. I am curious as to why the change, and when it exactly changed?

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Elitest thrill junkie
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I knew I wasn't crazy here is a page from the MT owners manual I downloaded when I bought my bike. I sent an email so hopefully GG can shed some light. I am curious as to why the change, and when it exactly changed?





I knew I wasn't crazy here is a page from the MT owners manual I downloaded when I bought my bike. I sent an email so hopefully GG can shed some light. I am curious as to why the change, and when it exactly changed?

View attachment 1956274
I bought mine this year, above is what I understood the geometry to be.
 

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I鈥檓 guessing the actual frame construction hasn鈥檛 changed. Has the fork specified changed (travel or axle to crown)? Are they now measuring in a different mode (gravity vs the other)? Or maybe it鈥檚 just a typo.


Sent from my iPhone using Tapatalk
 

always licking the glass
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I鈥檓 guessing the actual frame construction hasn鈥檛 changed. Has the fork specified changed (travel or axle to crown)? Are they now measuring in a different mode (gravity vs the other)? Or maybe it鈥檚 just a typo.


Sent from my iPhone using Tapatalk
Hey @marshalolson can you answer this one for us?
 

Formerly PaintPeelinPbody
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The measured A2C changed. Why? Not sure. The BB also got raised by 5mm in each mode.

Could be that the industry standard for 160-180mm forks shifted when the Mezzer, Zeb, and 38 hit the market.

When the Megatrail was first launched, the 170mm 36 had a a2c of 559mm. The Lyrik was similar. Ribbon at 170mm is similar as well.

The Zeb added 7mm. The 38 added 5mm.

What's weird is that the Megatrail is only specced with the Ribbon 170 and the Helm 170 (563mm a2c) so geo would remain unchanged against the 36 if that was the designed a2c back in 2019.

Did they maybe update the geo around the expectation of the Zeb and 38 being sold with the Megatrail, but can't offer those forks right now?
 

always licking the glass
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The measured A2C changed. Why? Not sure. The BB also got raised by 5mm in each mode.

Could be that the industry standard for 160-180mm forks shifted when the Mezzer, Zeb, and 38 hit the market.

When the Megatrail was first launched, the 170mm 36 had a a2c of 559mm. The Lyrik was similar. Ribbon at 170mm is similar as well.

The Zeb added 7mm. The 38 added 5mm.

What's weird is that the Megatrail is only specced with the Ribbon 170 and the Helm 170 (563mm a2c) so geo would remain unchanged against the 36 if that was the designed a2c back in 2019.

Did they maybe update the geo around the expectation of the Zeb and 38 being sold with the Megatrail, but can't offer those forks right now?
They don't offer the Megatrail with a 38 or a Zeb, but only a 170mm MkII or a 170mm Ribbon. Which, AFAIK, have not changed. This is why I asked Marshal for an answer.
 

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I would imagine it鈥檚 now measured with a Zeb. I would also imagine it will be offered with the Zeb when it鈥檚 available. They probably can鈥檛 get them right now is why DVO and CC are the only options.
 

always licking the glass
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Hi All,

I was able to connect with Matt on this. The Geo table was updated .5deg slacker based on a few mm additional on each of: fork a2c, tire, and headset cups.

thanks for checking!
This comes across as a surprise to many of us. Care to let us know if this is a correction to incorrect information, or if anything changed in the manufacturing of the stays or front triangle?
 

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Thanks to clarify, no changes to any GG manufactured elements. The stays, front triangle, etc are all the same.

just updating Fork a2c and tire OD.
Just out of curiosity, what tire diameters do you guys use? I'd guess a 2.4 rear and 2.5 front. Typical sizes I've seen in calculators put a 27.5x2.4 at like 705mm, 27.5x2.5 at 710mm, 29x2.4 at 745mm, and 29x2.5 at 750mm.
 

always licking the glass
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Great question @Andeh, I don't exactly know...
I do know the OD is measured based on the most common tire and rim spec from the previous year for each model.
Wow, that鈥檚 really nonspecific, especially given that GG has never published AtoC numbers, rim spec assumptions, or the most common tire. The only one of those numbers published has been fork travel.
 

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Honest question here, without also publishing exact tire pressure+casing or accounting for precise sag measurements to the millimeter (obviously all geometry numbers are un-sagged, which makes them less relevant), does this sort of precision really matter? I've never felt that, for example, my over-inflated rear tire has made my bike's head angle and seat angle steeper, or the reach is now shorter, even though those technically are true.

Does anyone ever notice things like a half degree in a highly variable dynamic environment?
 

Formerly PaintPeelinPbody
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It kinda depends on the level of geekery folks have for a certain elements of a bike.

Some folks are really into geometry. Fractions of a degree matters.

Some folks are really into weight. Grams matter.

Others are into suspension design.

Or where (or what material) frames are made out of.

It's really not whether those things are able to "felt" or even make a difference in terms of ride performance, it's that the buyer has that one element they research and compare and then it matters.
 

always licking the glass
Joined
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Honest question here, without also publishing exact tire pressure+casing or accounting for precise sag measurements to the millimeter (obviously all geometry numbers are un-sagged, which makes them less relevant), does this sort of precision really matter? I've never felt that, for example, my over-inflated rear tire has made my bike's head angle and seat angle steeper, or the reach is now shorter, even though those technically are true.

Does anyone ever notice things like a half degree in a highly variable dynamic environment?
Yep. Mobility, or limitations of, can make things like that make a bit difference in fit, and pain while riding. For other people, it may not be fit but performance reasons.

My body can be an absolute wreck if I don鈥檛 account for it.

But, my issues here are what feels like a lack of transparency. Changing geo numbers without telling people comes across, well, like we bought bikes based on what was published previously than what is published now.

Angles like HA and SA greatly affect fit, as does ETT (despite no one acts like it exists). BB height is another big one, especially for the current generation of MTBs (low, long, and slack).

Look, i like GG, and i want to see them succeed. My husband has two of them. What I don鈥檛 like is what could be considered information that determines whether or not someone buys a bike to be accurate and trusted and not change by surprise: like geometry and bike weights.
 
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