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Technical & Reference Section => Tech and Restoration => Topic started by: selfpreservation on October 03, 2006, 05:43 PM

Title: ok bmx eggheads
Post by: selfpreservation on October 03, 2006, 05:43 PM
heres a question for you

i bought a new chain and its longer than the one it replaced my wheel is now farther back than it was before by about 20mm

this effectively changes the wheelbase of the bike

how does this affect the ride seeing as there is about 90mm scope for moving the wheel about in the dropouts surely the extremes will have a pretty drastic effect on the handling.
Title: Re: ok bmx eggheads
Post by: RATTY on October 03, 2006, 05:45 PM
Egg head ehh? oh well you must have seen pics....

By moving the back wheel you can alter the wheelbase, thus making it easier or harder to wheelie, if the rear drop outs are not horizontal it may also alter the rake of the forks I think!!!!!!!
Title: Re: ok bmx eggheads
Post by: harris on October 03, 2006, 05:46 PM
longer wheel base is sturdy in they air, short makes it twitchy  but wouldnt matter to much just take a link out all will be back to normal or a bigger front gear.
Title: Re: ok bmx eggheads
Post by: selfpreservation on October 03, 2006, 05:56 PM
no i quite like it (covers the marks on the dropouts so i reckon its the correct length now ) it just got me thinking
has leary or fiola ever blamed a defeat on his chain being too long/short and stormed off in a hissy bitch fit , what i mean is , is it a consideration when building a bmx most bike have fixed dropouts racers mtbs ect in my experience so moving the rear wheel effectively changes the geometry of the bike   does the slotted drop out have a practical application eg small riders front of the drop out big riders back o the drop out? , i cant see a reason why you would want a bike to be unstable in the air so why include a slotted dropout
Title: Re: ok bmx eggheads
Post by: phantom photon on October 03, 2006, 06:02 PM
no i quite like it (covers the marks on the dropouts so i reckon its the correct length now ) it just got me thinking
has leary or fiola ever blamed a defeat on his chain being too long/short and stormed off in a hissy bitch fit , what i mean is , is it a consideration when building a bmx most bike have fixed dropouts racers mtbs ect in my experience so moving the rear wheel effectively changes the geometry of the bike   does the slotted drop out have a practical application eg small riders front of the drop out big riders back o the drop out? , i cant see a reason why you would want a bike to be unstable in the air so why include a slotted dropout

I suspect it's so you can change your chainwheel for smaller/larger without having to lengthen/shorten your chain  ;)
Title: Re: ok bmx eggheads
Post by: selfpreservation on October 03, 2006, 06:06 PM
no i quite like it (covers the marks on the dropouts so i reckon its the correct length now ) it just got me thinking
has leary or fiola ever blamed a defeat on his chain being too long/short and stormed off in a hissy bitch fit , what i mean is , is it a consideration when building a bmx most bike have fixed dropouts racers mtbs ect in my experience so moving the rear wheel effectively changes the geometry of the bike   does the slotted drop out have a practical application eg small riders front of the drop out big riders back o the drop out? , i cant see a reason why you would want a bike to be unstable in the air so why include a slotted dropout

I suspect it's so you can change your chainwheel for smaller/larger without having to lengthen/shorten your chain  ;)

that never occurred to me , so where do you put the wheel, in the middle of the droupout?
Title: Re: ok bmx eggheads
Post by: theRuler on October 03, 2006, 08:00 PM
90mm of adjustment?
thems some big ass dropouts

run the back end as short as possible
Title: Re: ok bmx eggheads
Post by: selfpreservation on October 03, 2006, 08:53 PM
90mm of adjustment?
thems some big ass dropouts

run the back end as short as possible
yeah i fooked up my inches to metric i meant about 75mm 3in as opposed to 90mm 3.5in
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