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  1. #1
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    Light disc brake adapters

    What do you think?

    140 mm rear/160 mm front - 9 gramms
    Light disc brake adapters-adapter-140.jpg

    160 mm rear/180 mm front - 10 gramms
    Light disc brake adapters-adapter-160.jpg

    183 mm rear/203 mm front - 12 gramms
    Light disc brake adapters-adapter-183.jpg

  2. #2
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    Very nice! Where did you get them? A new design of yours perhaps?

  3. #3
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    Quote Originally Posted by 2002maniac View Post
    Very nice! Where did you get them? A new design of yours perhaps?
    Thank You!
    Yes, this is my own design and I made ​​them

  4. #4
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    What's the material and manufacturing process? Curious engineer here

    They don't look like one-offs. Are you planning on producing a run of them?

  5. #5
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    I'd take one to run a 203mm rotor on the back of my V10. All my other mounts are direct already.
    Keep the Country country.

  6. #6
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    Quote Originally Posted by 2002maniac View Post
    What's the material and manufacturing process? Curious engineer here

    They don't look like one-offs. Are you planning on producing a run of them?
    Material - 2024 T4 aluminium
    manufacturing process - CNC Milling

    I am already have one batch

    Quote Originally Posted by Lelandjt View Post
    I'd take one to run a 203mm rotor on the back of my V10. All my other mounts are direct already.
    I believed that those who are fighting for the weight, do not use a 203mm rear rotors
    but I can make 203 mm rear

  7. #7
    bike rider
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    I'm curious about aluminum alloys. What properties made you choose 2000 series? Thread strength/hardness is important in this application. Does 2000 beat out 6000 in this department? Stiffness is also important here. Does it have an advantage in that department? How much would you want for a 203mm rear?
    Keep the Country country.

  8. #8
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    Quote Originally Posted by Lelandjt View Post
    I'm curious about aluminum alloys. What properties made you choose 2000 series? Thread strength/hardness is important in this application. Does 2000 beat out 6000 in this department? Stiffness is also important here. Does it have an advantage in that department? How much would you want for a 203mm rear?
    7075 would be better, but not by much
    2024 noticeably stronger than 6061, 6061 major advantage is that it weldable
    I'll draw a 203mm rear and show you

  9. #9
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    target weight about 17g
    Light disc brake adapters-brake_adapter_rr203.jpg

  10. #10
    bike rider
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    Doing a little googling makes it look like my 203mm rear Formula adapter weighs 21g. That seems too low? Anyone know the weight of standard Shimano, Formula, or Avid 203mm adapters?
    Keep the Country country.

  11. #11
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    Quote Originally Posted by Lelandjt View Post
    Doing a little googling makes it look like my 203mm rear Formula adapter weighs 21g. That seems too low? Anyone know the weight of standard Shimano, Formula, or Avid 203mm adapters?
    Disc adapters - Sick Lines ? mountain bike reviews, news, videos | Your comprehensive downhill and freeride mountain bike resource

    I do not think that the Formula adapter weighs 21 grams

  12. #12
    bike rider
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    So 35-38g is more likely. How much would your 17g mount cost me? I'm down to lose 17g. This V10 is becoming my favorite weight project yet. It's already likely the lightest no-compromise DH bike in the world.
    Keep the Country country.

  13. #13
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    Quote Originally Posted by Lelandjt View Post
    So 35-38g is more likely. How much would your 17g mount cost me? I'm down to lose 17g. This V10 is becoming my favorite weight project yet. It's already likely the lightest no-compromise DH bike in the world.
    see pm...

  14. #14
    > /dev/null 2&>1
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    Re: Light disc brake adapters

    Quote Originally Posted by Lelandjt View Post
    So 35-38g is more likely. How much would your 17g mount cost me? I'm down to lose 17g. This V10 is becoming my favorite weight project yet. It's already likely the lightest no-compromise DH bike in the world.
    No offense to OP but I'm not sure you wanna take someone's self made weight shaver parts and throw them on your DH rig. Anyone can make parts lighter, how do you have any idea if they're going to hold up? Trying this on some light xc ride is one thing but throwing them on a v10 is a different ball game.

    Op, did you do any stress estimates for these? How did you model dynamic stresses from braking in different situations with different speeds, rider weights, etc.? What testing have you done?

    Not trying to be a jerk, just trying to be practical about this and save someone an expensive crash.


    Sent from (redacted by nsa)

  15. #15
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    Quote Originally Posted by ddprocter View Post
    No offense to OP but I'm not sure you wanna take someone's self made weight shaver parts and throw them on your DH rig. Anyone can make parts lighter, how do you have any idea if they're going to hold up? Trying this on some light xc ride is one thing but throwing them on a v10 is a different ball game.

    Op, did you do any stress estimates for these? How did you model dynamic stresses from braking in different situations with different speeds, rider weights, etc.? What testing have you done?

    Not trying to be a jerk, just trying to be practical about this and save someone an expensive crash.


    Sent from (redacted by nsa)
    in fact, these adapters are thick enough, just the excess material removed on them

    I was doing FEA for these adapters

    adapters from the first message has been tested on several bikes - no problems even with the stiffness, all the same, only lighter

    in fact it is not the most loaded bicycle parts, the load on them is limited by traction of tires

  16. #16
    > /dev/null 2&>1
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    Re: Light disc brake adapters

    How do you model the dynamic loads? And, again, I'm seriously not trying to bust your balls, I'm just curious.

    You make a good point, when braking on a flat surface, sure the braking force is limited by traction, but in mountain biking i could foresee peak loads much higher when:

    a) wheel is traveling through ruts and other features, under compression, thus causing short term peaks in the effective traction, or where the wheel is under heavy compression due to landing a jump or drop

    . . . and simultaneously b) the rider is providing max breaking force


    These two events together, which tend to be more frequent and more intense on a dh bike with typical dh riding, seem like they could generate much higher braking force at the caliper than in a flat braking situation. Then you've got momentum of different riders at different speeds, up to say, 38lb bike, 220+ lb rider, speeds up to 25-30mph . . . I haven't done fea in >10y, and I'm not asme, I'm not claiming i could second guess your analysis, but as far as i know this all seems quite difficult - to do FEA you've gotta tell it what force you expect, along which vector you expect it. That seems like it would require a lot of complex dynamic modeling or in the field stress measurements.

  17. #17
    bike rider
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    On my DH bike I can definitely generate high braking loads. I use a very gripy 2.7" tire and have 10" of suspension so when braking through bumps there are times when the tire is PRESSED into the ground. I ripped apart 3 American Classic hub shells by tearing the disc tabs from the flange.

    I'm trusting your engineering but just saying that if you offer 7" & 8" adapters you gotta figure in the additional force that type of rider is capable of creating due to the type of bike, tires, and terrain those sizes are used on.

    With 6" rotors it's pretty safe to assume they will be used with limited grip tires.
    Keep the Country country.

  18. #18
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    From this point of view, the only sure way of testing is the real riding
    I use the rear 183 mm on my IronHorse Sunday with no problems
    These adapters are not much weaker than normal, just the material removed from the unstressed areas

    again - the load on the adapter is not so great, they strapped by caliper and they must transfer the load on the bolts only, and the bolts is not very strong, have you ever heard of a bent adapter mounting bolts?

  19. #19
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    Light disc brake adapters

    Quote Originally Posted by mk00 View Post
    From this point of view, the only sure way of testing is the real riding
    I use the rear 183 mm on my IronHorse Sunday with no problems
    These adapters are not much weaker than normal, just the material removed from the unstressed areas

    again - the load on the adapter is not so great, they strapped by caliper and they must transfer the load on the bolts only, and the bolts is not very strong, have you ever heard of a bent adapter mounting bolts?
    Talking about bolts, how much thread lengths does the caliper bolts have in these new adaptors ? Especially the 140 and 160 ones ?
    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

  20. #20
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    Quote Originally Posted by David C View Post
    Talking about bolts, how much thread lengths does the caliper bolts have in these new adaptors ? Especially the 140 and 160 ones ?
    8 mm

    I think my adapters is stronger than, for example, this:
    Name:  $T2eC16VHJHYE9nzpeCqeBQP(4gp,pw~~60_12.JPG
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  21. #21
    I Tried Them ALL... Moderator
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    Big rotor + light weight = makes NO sense, IMHO

    And, I'm a huge weight weenie...I weigh grease!
    "The mind will quit....well before the body does"

  22. #22
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    ^Anything less than an 8" rotor is a compromise for DH. You need the large area for heat management. What's wrong with making your DH race bike as light as possible without compromising its performance? BTW, those 8" rotors are carbon and I've been racing on them all season.
    Keep the Country country.

  23. #23
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    Quote Originally Posted by Lelandjt View Post
    BTW, those 8" rotors are carbon and I've been racing on them all season.
    can you post the link?

  24. #24
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    Kettlecycles.com
    SFL rotors. I have 6", 7", and 8" on my three bikes. Using them with Formula organic pads until the carbon pads are ready. I cooked and glazed the pads on my 6" bike once but sanding them brought back power. Besides that everything's been perfect.
    Keep the Country country.

  25. #25
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    I'll take a 140mm rear adapter, how much/how long till ready?

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