# General Cycling Discussion - Calling all mathaletes (serious nerds)

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minivandriveby
10-05-07, 02:07 PM
Ok. I'm curious and just too lazy to figure this out. Plenty of engineers and idiot savants watching the clock right now so here's a little math work for you. First one with the right answer wins thanks and praise from yours truly...

A bike has a 130mm stem with 0 degrees. Stem is replaced with same length stem but has a 17 degree rise. How much lift in mm/inches would that bring about?

I told you it was easy. ;)

Little Darwin
10-05-07, 02:24 PM
If you are looking for extreme accuracy, you need to let us know what the head tuibe angle is... :D

10-05-07, 02:31 PM
130sin(17)=38mm, but it will be 6mm closer to you. You might want to go with a 135mm stem at 17 degrees.

PS, don't be an ass.

ryder47
10-05-07, 03:57 PM
130sin(17)=38mm, but it will be 6mm closer to you. You might want to go with a 135mm stem at 17 degrees.

PS, don't be an ass.

+1 Just a confirmation.

minivandriveby
10-05-07, 03:58 PM
.

PS, don't be an ass.

ryder47
10-05-07, 04:01 PM
Ok. I'm curious and just too lazy to figure this out. Plenty of engineers and idiot savants watching the clock right now so here's a little math work for you. First one with the right answer wins thanks and praise from yours truly...

A bike has a 130mm stem with 0 degrees. Stem is replaced with same length stem but has a 17 degree rise. How much lift in mm/inches would that bring about?

I told you it was easy. ;)

Maybe your comment in bold above?

minivandriveby
10-05-07, 04:11 PM
I thank you for the answer. I was just attempting humor, not intending to hurt your feelings. I'm sorry.
I am an ass, but not the bad, nasty kind... Again, apologies.

mayukawa
10-06-07, 11:33 PM
Are they the same brand of stems? If not, then their stack height is probably different, which would affect your answer...and of course you'll need to know the headtube angle to give a meaningful answer.

MtbVA
10-09-07, 03:36 PM
56277

Nicodemus
10-09-07, 03:56 PM
what's all this now? basic trig question being labelled for mathletes?

no no no no no, that's not mathlete material at all. Not good enough, sonny laddy jimmy laddy sonny jimlad sonny jim.

give me 7 state nonlinear inherently unstable optimization or give me death.

pah, kids these days.

minivandriveby
10-10-07, 09:28 AM
56277

That's what I'm talking about. Nice! Thanks. Now back to drums and space... :lol: