rear-end length

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3/3/2015 1:35 PM

Hi guys,

just got a quick question about frame geometry, I'm toying around with the idea of a custom frame but I'm always terrible at figuring out rear end length, i run 28t-9t gearing, but don't know if i can slam a 13" rear (25-9 probably can but i don't like that ).

do I need to go a little shorter than 13 to be able to slam 28-9 ?

Thanks

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3/3/2015 1:49 PM

Should be able to if you use a single half link

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3/3/2015 1:53 PM

28/9 slams at about 13.05

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3/3/2015 2:17 PM

Saw the title rear-end length and thought we would be discussing another matter.

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3/3/2015 4:01 PM

what frame ?

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old edit

3/3/2015 4:12 PM

tomdon wrote:

28/9 slams at about 13.05

Thanks for the help man! smile

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3/3/2015 4:21 PM

OneGuyIlluminatiEye wrote:

what frame ?

It's probably going to be an FBM or Laird custom, I'm trying to figure out the CS length so i can slam 28/9, because all the frames in the market are design for 25/9.

I like 13" cs but i guess i have to go 13.05cs for 28/9.

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3/3/2015 4:26 PM
Edited Date/Time: 3/3/2015 4:27 PM

For future reference, I always use one of these. They're damn close to perfect. As accurate as I've ever seen

http://eehouse.org/fixin/formfmu.php

http://www.fortytwobmx.com/bmxtech_gearratio.html

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3/3/2015 4:32 PM

tomdon wrote:

For future reference, I always use one of these. They're damn close to perfect. As accurate as I've ever seen

...more

Nice man, thanks so much.

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3/3/2015 8:49 PM

Stocksy wrote:

Saw the title rear-end length and thought we would be discussing another matter.

Bwahahaha.

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3/4/2015 2:39 AM

Fits website gives CS length with different set ups too.



9T
28/9: 13.125 W/ Half Link
27/9: 13.25 W/ Half Link
27/9: 13.00 W/Out Half Link
25/9: 13.00 W/ Half Link
25/9: 13.25 W/Out Half Link
8T
23/8: 13.125 W/Out Half Link
25/8: 13.125 W/ Half Link
26/8: 13.00 W/ Half Link
26/8: 13.25 W/Out Half Link

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3/4/2015 5:17 AM

looks like 27/9 is what your gonna want to roll on, ive used this gear ratio for awhile now feels alot better than 28/9 and not too easy like 25/9

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Testimony and apologies





I want everyone to know that Jesus Christ died on the cross for all of your sins, he went to hell for three days and defeated death and rose from the grave on the 3rd day.






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What would Jesus say: I didn't die for you to live like this!

old edit

3/4/2015 5:24 AM

Hatebreeder wrote:

Fits website gives CS length with different set ups too.



9T
28/9: 13.125 W/ Half Link
27/9: 13.25 W/ Half Link
27/9: 13.00 ...more

Those are all rounded numbers

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3/4/2015 5:37 AM
Edited Date/Time: 3/4/2015 5:38 AM

I just sent an email to fbm with my ideas, hope it's not too expensive or I'm going lairdframe

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3/4/2015 9:10 AM
Edited Date/Time: 3/4/2015 9:10 AM

I ride a fiend embryo, this frame got a 13,75 slammed but i can't slam it with my 28x9, i had try with a 25t sprocket and it works.

But fuck that, wheel slamming is a completely dumb concept, if you really want to ride a 13" chainstays, take a frame with a 12.5 or 12. something to get your wheel to 13" without slamming it.

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3/4/2015 9:22 AM

Francky wrote:

I ride a fiend embryo, this frame got a 13,75 slammed but i can't slam it with my 28x9, i had try with a 25t sprocket and it ...more



Photo

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Testimony and apologies





I want everyone to know that Jesus Christ died on the cross for all of your sins, he went to hell for three days and defeated death and rose from the grave on the 3rd day.






instagram
What would Jesus say: I didn't die for you to live like this!

old edit

3/4/2015 9:27 AM

Francky wrote:

I ride a fiend embryo, this frame got a 13,75 slammed but i can't slam it with my 28x9, i had try with a 25t sprocket and it ...more

I have never slammed my wheel because of the gears I run, so it's not like I have to, but I figured if I'm paying for a custom frame why not get all the geometries exactly how I want them

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