BMX General > BMX Chat
What`s the "next big thing " in BMX?
superbikedan:
that pics the nuts bill, aint seen that pic before :coolsmiley: very kool :daumenhoch:
SaMAlex:
--- Quote from: perry on June 10, 2008, 09:48 PM ---trials bikes have a continuous freewheel because when they are hopping around on the rear wheel and about to release the brake/put all your weight on the pedal for a gap the last thing you want is to find you chain has come off . so the clicking lets you know your ready to go . it also keeps the weight in the centre of the bike so makes it easier to throw around
--- End quote ---
I dont get what you are saying here. Freewheeling is freewheeling, no matter if its on the front or the rear sprocket? Do you mean they can hear it better cos its closer to them? I dont understand :crazy2:
--- Quote from: perry on June 10, 2008, 09:48 PM ---maybe someone will give a fixed chainstay and eccentric bottombracket a go
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Yeah, that would be a great idea for todays bikes. Its been done a few times on BMX's (for verious prototype bikes) but it was always using a euro BB or had a massive shell. You could probably to a nice one with a spanish or Mid BB
--- Quote from: perry on June 10, 2008, 09:48 PM ---ooh , fluted tubed forks and ive always had a press in alloy steerer tube in the back of my mind
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The Pitchfork XLT has an ally "X" extrusion pressed up the steerer tube.
billstup:
--- Quote from: SuperBikeDan on June 10, 2008, 11:25 PM ---that pics the nuts bill, aint seen that pic before :coolsmiley: very kool :daumenhoch:
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Thats because you don`t venture into the racing section Dan ::)
perry:
beauty of a pic that 8)
alex - im in no way entirely clued up on trials but a few mates that have given it a go liked them as they know the chain is fine as its moving . but with the freewheel in the rear it could click without the chain being on the tooth . if you picture a normal rear freewheel that had just got a loose chain from hopping around the slack at the bottom might not engage with the teeth when the bike moves or is pedaled but htees no way of knowing unless yo had a looksie . with it on the cranks if it was slack any movement would have the chain off before any more hopping about happened . or something like that :-\
i stole this from wikipedia "Front freewheels can currently be found on bikes used for bike trials riding. Putting the freewheel on the crank allows some weight to be taken off the rear hub, centering the weight of the bike a little more, making it easier to lift the back wheel as well as simplifying the rear hub, allowing the bearings to sit as far outboard as possible, reducing bending on the hub axle. Because bikes with this set up are almost always singlespeed none of the gear shifting issues that arose in geared systems are problems with this arrangement. The reason for the adoption of front freewheels is likely to be due to the availability of extremely strong screw-on BMX freewheels before the advent of specific components for trials bikes. In fitting the freewheel to the cranks rather than to the back hub a smaller chainring size was possible at the cranks with a gear ratio suitable for trials, increasing the ground clearance of the bike. BMX freewheels could also carry more torque and were cheaper than mountain bike designed systems at the time front freewheels were introduced."
id like to see an eccentric bottom bracket in us size with mid bearings in offset cups , not too big , a thin us shell wouldnt weigh to much , cups and bearings would press in fine and it would give enough tension without upsetting the bb height . but its at the rear where it would really benefit as it could do away with plate dropouts and have the chain/seat stays meeting in a small tube large enough to put a socket into . but that closed method would negate a gsport type bolt in hub but theres no reason why a neat alloy clamp couldnt be made to bolt in a normal axle ( kinda like big dh bikes are using )
sure it would lose the adjustable chainstay length and the chain would have to be removed with a tool or split link but there wouldnt be any more miss aligned wheels and it would create a stronger structure . not to mention no longer having the wheel pushed around by missing grinds
i mean an entirely alloy steerer pressed in from beneath so it wouldnt part . but its one of those ideas thats not really a good idea ;D
BOBLAMBO:
carbon frames,forks,bars,pedals,rims,crank arms
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