Ask the experts

[J. Barron DeJong]

Anyone know or have experience with a bike fitting system called id match? https://www.idmatch.cc/en

Started doing longer road rides and am experiencing really bad lower back pain now so thinking it's time for a proper bike fit.

There's a local guy who does bike fitting using the above system. Seems a touch gimmicky to me but I have zero knowledge in this area. Anyone use it by any chance? Thoughts?

Maybe do you can do it DIY, with the help of AI motion capture:

https://www.cyclingweekly.com/fitnes...-they-differed

Haven’t used it, I like the idea of being able to make it an iterative process, which is likely to get very expensive if going to a fitter.

As you’re ramping up on riding are you limiting other exercises that strain your back, like maybe not doing deadlifts? (i.e. is it possible it’s getting sore from overuse, not position?)

[Thaleia]

A tool is just a tool. They can make the job easier, but it's the person running the show that makes the difference.
The biggest issue with systems like this is that they are decent at getting people within a "box of acceptability". Your knee angle should be this, hip angle that,.... etc.
That may help your issue, or you may be someone who can't be in a normal box.

Good insight, appreciate that.

Maybe do you can do it DIY, with the help of AI motion capture:

https://www.cyclingweekly.com/fitnes...-they-differed

Haven’t used it, I like the idea of being able to make it an iterative process, which is likely to get very expensive if going to a fitter.

As you’re ramping up on riding are you limiting other exercises that strain your back, like maybe not doing deadlifts? (i.e. is it possible it’s getting sore from overuse, not position?)

Interesting, thank you, wasn't aware of that option.

I don't really exercise other than cycling.

[singlesline]

Why is my chain suddenly loose in the 12th cog? OK in 11 and shifts fine.

Should be able to fix this with the B screw but why all of the sudden? B screw moved? Seems like a lot for it to slip.

edit: yeah, b screw was way out. Brought it back to spec and there’s just a tiny bit of tension on the chain in the little cog.

[beaterdit]

Hit it with some Loctite

[jamal]

derailleur hanger slipped/rotated?

[thefortrees]

We are moving from SLC to Bellingham in October. My wifes Code RSC's are about ready for new pads. Anything to know about what works best for the wet winters? Right now she has the stock Sram metallic pads which havn't given her any issues. Metallic vs organic up there? Better after-market options suited for the climate?

Thanks!

Mtx red if you want quiet brakes in the wet

[volklpowdermaniac]

gonna completely break this down and rebuild... what's a good soaking medium to start with for a 24-48 hour type of thing before i dig in?

[Andeh]

When I've rebuilt Kings, I've just blasted them with aerosol suspension cleaner then compressed air to get the chunks out. After a couple rounds of that, any liquid comes out clean.

[volklpowdermaniac]

When I've rebuilt Kings, I've just blasted them with aerosol suspension cleaner then compressed air to get the chunks out. After a couple rounds of that, any liquid comes out clean.

beauty

[rideit]

Why is my chain suddenly loose in the 12th cog? OK in 11 and shifts fine.

Should be able to fix this with the B screw but why all of the sudden? B screw moved? Seems like a lot for it to slip.

edit: yeah, b screw was way out. Brought it back to spec and there’s just a tiny bit of tension on the chain in the little cog.

What Beatered said. But first, remove the b-screw, and clean with solvent or something. There is also an old race technique of using a tiny nut that fits on the screw in order to make it lock into place. Super bomber solution.

[SJG]

Shimano B-screws MOVE, back out. Buddy of mine had his move, jockey wheel touched cassette, cassette pulled it in and BOOM. Burning $.

I've tried loctite, but nothing works as well as a lock nut. I don't understand why they don't put them on from factory, what is it 3g?

[singlesline]

My new MTX golds also became loud AF by the end of their first day. Earlier bike I put them on they were not loud at all.

MTX does say you might need to prep the rotors if coming from metallic pads and I definitely did not do that...

https://support.mtxbraking.com/hc/en...my-used-rotors

I ran through MTX’s full rotor prep instructions, sanded the pads back to a fresh surface, did a full bleed, bedded them back in.

They seem quiet now? Got an occasional noise out of them, but not the heinous screeching they were making by the end of my first day on the.

[Roxtar]

gonna completely break this down and rebuild... what's a good soaking medium to start with for a 24-48 hour type of thing before i dig in?

Like others say, just clean and relube. Soaking the entire assy in any solvent risks damaging the seals and any plastic components.

[XXX-er]

I ran through MTX’s full rotor prep instructions, sanded the pads back to a fresh surface, did a full bleed, bedded them back in.

They seem quiet now? Got an occasional noise out of them, but not the heinous screeching they were making by the end of my first day on the.

I bought a used Fat bike with screeching brakes so for the rotor prep I used a red sanding disc chucked in my drill, run it at a slight angle the disc will rotate the wheel/ rotor as it sands and then bed the pads in doing hard the stop on a big hill

[joetron]

Diaz Suspension Design has a pretty good series of IG posts going about fork alignment rn. He shows before and after videos and talks about where they find issues. Spoiler: He doesn’t describe exactly what he does to fix things, because that’s how he pays the rent.
It’s the most recent 4 posts on his profile.


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[frorider]

^ as in Stanchion - lowers alignment. Yes the vids are interesting, esp since he points out this has nothing to do with burnishing the bushings.

[Wes Mantooth]

Is sudden brake failure a good sign a bleed needs to happen or should I be looking elsewhere? First time it’s happened to me on my dominions, but a long steep fast descent yesterday left my rear brake with zero power and the lever pulling straight into the grip for a couple mins until it cooled off

My understanding of this is that small amounts of water get into the system over time and mix with the dot fluid. When the water pockets hit a boiling point they compress and the system loses all power. Presumably putting fresh fluid in would decrease the water content and mitigate the issue? Or is this a sign of a leak etc

And yes I understand proper braking technique to mitigate heat buildup - been using these for years on large descents and bike park days and never had an issue before

[jdadour]

Diaz Suspension Design has a pretty good series of IG posts going about fork alignment rn. He shows before and after videos and talks about where they find issues. Spoiler: He doesn’t describe exactly what he does to fix things, because that’s how he pays the rent.
It’s the most recent 4 posts on his profile.


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I saw those too, and am very interested. Does anyone know more about what he is doing?

[joetron]

Is sudden brake failure a good sign a bleed needs to happen or should I be looking elsewhere? First time it’s happened to me on my dominions, but a long steep fast descent yesterday left my rear brake with zero power and the lever pulling straight into the grip for a couple mins until it cooled off

My understanding of this is that small amounts of water get into the system over time and mix with the dot fluid. When the water pockets hit a boiling point they compress and the system loses all power. Presumably putting fresh fluid in would decrease the water content and mitigate the issue? Or is this a sign of a leak etc

And yes I understand proper braking technique to mitigate heat buildup - been using these for years on large descents and bike park days and never had an issue before

Yes. First thing to do would be a full bleed of the system and replacement/flush of the old fluid. DOT fluid does absorb water and also breaks down over time with the heat and pressure of the braking system. Brake fluid should be replaced at least once a year if you’re riding regularly, especially in the park and with big mtn descents.
It’s a good time to check pad and rotor wear, replace as needed.
Unless you had a big wreck recently that might have damaged the lever or caliper, it’s likely not a leak, but I’ve had one Dominion lever leak from the seam of the bladder cap.


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[Wes Mantooth]

Yes. First thing to do would be a full bleed of the system and replacement/flush of the old fluid. DOT fluid does absorb water and also breaks down over time with the heat and pressure of the braking system. Brake fluid should be replaced at least once a year if you’re riding regularly, especially in the park and with big mtn descents.
It’s a good time to check pad and rotor wear, replace as needed.
Unless you had a big wreck recently that might have damaged the lever or caliper, it’s likely not a leak, but I’ve had one Dominion lever leak from the seam of the bladder cap.


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Cool thanks. I do bleed annually, but been riding 7 days a week recently so may need a sooner interval. Just checked/changed pads and checked rotors, cleaned calipers etc so figure it’s likely just faster than usual wear on the dot fluid

[toast2266]

Cool thanks. I do bleed annually, but been riding 7 days a week recently so may need a sooner interval. Just checked/changed pads and checked rotors, cleaned calipers etc so figure it’s likely just faster than usual wear on the dot fluid

If your bottle of DOT fluid is old, it might have just absorbed enough water out of the air that even though it's "new" fluid, it's still got a bunch of water in it and the boiling point is significantly lowered.

[Wes Mantooth]

If your bottle of DOT fluid is old, it might have just absorbed enough water out of the air that even though it's "new" fluid, it's still got a bunch of water in it and the boiling point is significantly lowered.

True, I don't think it's that old, but did read somewhere that it can absorb enough moisture within 2 years to cause problems, even in a closed container

[Dumbest Known Time]

That reminds me of one of more puckering moments on a bike. Descending on one of the 20% steep roads that exits out of Forest Park in Portland on the gravel bike that I hadn't touched in probably 6 months. Braking way too hard and fast, both front and rear shit the bed with no power. If there hadn't been a driveway pointed uphill to serve as my runaway truck ramp I would have either been spit out into traffic at 40 mph or hugged a doug fir at about the same speed.

A thorough bleed fixed it just fine.

[Falcon3]

Diaz Suspension Design has a pretty good series of IG posts going about fork alignment rn. He shows before and after videos and talks about where they find issues. Spoiler: He doesn’t describe exactly what he does to fix things, because that’s how he pays the rent.
It’s the most recent 4 posts on his profile.

Good timing! I sent my Zeb to them a couple weeks ago and they called me about it today. Said my mis-alignment was a "3.5 out of 5" in their experience and was adding significant stiction. I had initially put a custom tune on my service request but they said I should notice a big improvement with the alignment and talked me out of the tune. Pretty stoked to get it back on the bike, I'm really liking the Fox38 I put on but stoked to feel a properly set up Zeb also.

[Roxtar]

Good timing! I sent my Zeb to them a couple weeks ago and they called me about it today. Said my mis-alignment was a "3.5 out of 5" in their experience and was adding significant stiction. I had initially put a custom tune on my service request but they said I should notice a big improvement with the alignment and talked me out of the tune. Pretty stoked to get it back on the bike, I'm really liking the Fox38 I put on but stoked to feel a properly set up Zeb also.

I'd LOVE to see their process for doing this.
The factory forges/casts these things with massive fixtures throughout the manufacturing process to keep everything lined up. I can't imagine how Diaz can tweek these to the minute amount it takes to "improve" on the factory straightness (% of mm) without an enormous investment in machinery.
I hope he's not just doing it by hand and feel.