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Technical & Reference Section => Tech and Restoration => Topic started by: Frosty on October 04, 2006, 02:58 PM

Title: Never seen this before
Post by: Frosty on October 04, 2006, 02:58 PM

and thought I would post a pic up from bmxmuseum

(http://www.radbmx.co.uk/archive/albums/y91/frosty_paul/Profile/1986ChampProDualDrive.jpg)

check out the dual drive :4_17_5:

Title: Re: Never seen this before
Post by: phantom photon on October 04, 2006, 03:00 PM

Utter bonkers  :idiot2:

Title: Re: Never seen this before
Post by: hoger548 on October 04, 2006, 03:08 PM

What the fook :2funny:

Title: Re: Never seen this before
Post by: Sanmarcopizza on October 04, 2006, 03:24 PM

So that's why cycle clips come in pairs. I always wondered why, now I can die a happy man.

Title: Re: Never seen this before
Post by: DR VINOAH on October 04, 2006, 03:29 PM

Quote from: Sanmarcopizza on October 04, 2006, 03:24 PM

So that's why cycle clips come in pairs. I always wondered why, now I can die a happy man.

 :2funny:

Title: Re: Never seen this before
Post by: selfpreservation on October 04, 2006, 05:42 PM

thats cheatin

Title: Re: Never seen this before
Post by: duncan on October 04, 2006, 06:09 PM

Like the Clemtwin crank idea, but with Profiles.
That would be pricey for  2 drive side cranks.

Wasn't it really difficult to get both chains equally tensioned, so one chain would always end up coming off when the frame flexed?
I recall reading an article a while back.

Agree about the cycle clips :)

Title: Re: Never seen this before
Post by: Waxintaxin on October 04, 2006, 08:01 PM

would it give more power , surely not

Rich

Title: Re: Never seen this before
Post by: MartyC on October 04, 2006, 08:57 PM

Quote from: Waxintaxin on October 04, 2006, 08:01 PM

would it give more power , surely not

Rich

Maybe, but if so it's totally wasted by using Z Rims   :LolLolLolLol:

Title: Re: Never seen this before
Post by: lazychubs on October 04, 2006, 09:03 PM

spesh if its a flip flop hub as he wont be able to stop peddling
even when the pedal falls off as its on the wrong side lol

Title: Re: Never seen this before
Post by: duncan on October 04, 2006, 09:03 PM

I read that the idea was to reduce power lost to flex, because a single chainring tends to pull the wheel and frame to one side.
But technical problems (i.e. the chain(s) tending to come off) meant it wasn't very practical.
There's a thread on vbmx about it (not the bike above, but clem cranks in general).

Title: Re: Never seen this before
Post by: aditup2004 on October 04, 2006, 09:19 PM

I just think its silly.  :uglystupid2:

Title: Re: Never seen this before
Post by: duncan on October 04, 2006, 09:32 PM

Yep, a solution looking for a problem.

Title: Re: Never seen this before
Post by: sonic-1 on October 04, 2006, 10:07 PM

well defo diffrent , thinkin about it yer would lose power to the rear wheel as more drive train yer have = more power lost

Title: Re: Never seen this before
Post by: Waxintaxin on October 04, 2006, 10:14 PM

its like 2 crank shafts and still using the 1 engine, friction would play a part and so would the general resistance of the chain and the sprocket , would that flex outway that .

Fuk knows and quite frankly it would fuk up both inside legs of me trousers so i dont care.

Rich

Title: Re: Never seen this before
Post by: Frosty on October 05, 2006, 10:33 AM

techie issues aside I think it looks the nuts :daumenhoch: