[FishMan473]

My old XT brakes have been giving me some trouble, so I'm thinking of upgrading to the new shiny... and if I can save some weight while doing it, great. But I'm looking at the brake weights, pulling from BikeRumors for the new stuff and around the web for the old stuff, and it appears that the new XT and XTR brakes are actually a lot heavier than the previous versions?

Model Weight Price
Shimano SLX M7100 850g $350
Shimano XT M8000 529g $400
Shimano XT M8100 Race 784g $420
Shimano XTR M9000 Race 396g $340
Shimano XTR M9100 Race 624g $560

What am I missing here?

 

[MSU Alum]

IDK how accurate the weights are, but XT M8000's are almost always on sale. $95 each on competitivecyclist and Jenson, and $35 each for icetech rotors.

I'd guess the XTR 9000 weight and price is brakes only, and the M9100 includes rotors but I'm getting a headache thinking about it.

 

[Aglo]

You are comparing complete brake sets (front and rear), to single front or rear kit.

 

[FishMan473]

These are weights for front and rear, but maybe the new brake set weights included the rotors?

That would be odd since the rotors are listed separately.


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[MSU Alum]

These are weights for front and rear, but maybe the new brake set weights included the rotors?

That would be odd since the rotors are listed separately.

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True, but not as odd as a half pound difference between comparable brakes, I suppose.

 

[Aglo]

Example on the Bikerumor site:

BRM8100-BLM8100 (160mm rotor + all hardware): 392g

 

[FishMan473]

Well, assuming they come with 160mm rotors, the XT8100 rotors are listed at 109g and XTR9100 at 108g

So perhaps we can subtract 220g from the x100 series brakes to compare to the x000 series brakes?


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[FishMan473]

Link to my source:

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[*OneSpeed*]

Are you sure they didn't publish the weight of the 4 piston caliper? Are you comparing apples to apples?

 

[Aglo]

Well, assuming they come with 160mm rotors, the XT8100 rotors are listed at 109g and XTR9100 at 108g

So perhaps we can subtract 220g from the x100 series brakes to compare to the x000 series brakes?

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I think they are including the bolts too, when they say "+ all hardware".

 

[Groove_c]

You can keep your existing levers and if you have an all mountain/trail bike, consider upgrading to 4 pistons calipers for less wheels locking when braking in wet/slippery conditions and have more power than with 2 pistons (more towards the end of the stroke), thus less fingers' fatigue during prolonged braking and in total, at the end of your rides.

 

[Groove_c]

https://www.bike24.com/p2324266.html?q=br-m8120

 

[One Pivot]

The 785 xt brakes weighed 290g. The new m8000 brakes weigh 290g. XTR's are 266g as measured by comp cyclist.

I think you should double check the weight on your existing XT brakes. The new ones most definitely arent much heavier, if at all.

 

[the mayor]

Consider your source.
I only read Bikerumor to see how many errors they have in every poorly written article.
And the comments under each article are pure gold.

 

[cobba]

Average Weight (kit for front 800 mm, w/ 160 mm recommended disc brake rotor, w/ lock ring, w/o adapter, w/ 2 bolts, w/ resin pad)

https://productinfo.shimano.com/#/spec/MTB/Brake%20(Hydraulic%20disc%20brake)

 

[*OneSpeed*]

^ oh sure, make it easy by going strait to the source.

 

[Forest Rider]

It shouldn't be a problem though.

Despite the new brake system having comparable weight to bricks (relative to your old brakes), they are stronger than your failing brakes and will stop you just fine.

The added weight while climbing will make you stronger than your competition equipped with those cheap, light-weight brakes.

 

[Shark]

Worrying about weight is so last year

 

[FishMan473]

So it sounds like, XTR is effectively the same weight between 9000 and M9100, XT gets maybe 35g heavier, so 5%, NBD.

Weights without Rotors, calculated.
Model ESTIMATED Weight Price
Shimano SLX M7100 630g $350
Shimano XT M8000 529g $400
Shimano XT M8100 Race 564g $420
Shimano XTR M9000 Race 396g $340
Shimano XTR M9100 Race 404g $560

Thanks all for helping me sort this out. You would think after 15 years of disc brakes being our dominant brake type, we'd have figured out a consistent way to define/compare weights.

 

[One Pivot]

You dont have to guess or estimate... people actually have weighed all of this. 290g before, 290g now. Give or take 10 grams for either model to account for hoses cut shorter or longer.

I dunno, it seems like our system is pretty dialed. People put stuff on scales and post pictures. I was just using competitive cyclists and the first few images of brakes on scales from google.