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Topic: Hub gears

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Bicycle

	Hub gear - Wikipedia, the free encyclopedia
		Hub gears are used mostly on utility bikes and various types of small wheeled bicycle, such as folding bikes.
		Hub gears work by internal planetary or epicyclic gearing, which means that the outer case of the hub gear unit (which is attached to the spokes) is made to turn at a different speed relative to the rear wheel's sprocket depending on which gear is selected.
		Unlike derailleur gears, where the gears and mechanism are exposed to the elements, hub gears are enclosed within the hub of the bicycle's rear wheel.
	en.wikipedia.org /wiki/Hub_gear (635 words)

	Hub gears
		Hub gears are less common than derailleur gears which are the dominant gear system on most modern bicycles.
		Hub gears work by internal planetary or epicyclic gearing, which means that the outer case of the hub gear unit (which is attached to the spokes) is made to turn at a different speed to the rear wheel's axle depending on which gear is selected.
		Hub gears were invented in 1903 by an English company called Sturmey Archer[?], and by the 1930s they had become common on bikes across the world.
	www.ebroadcast.com.au /lookup/encyclopedia/hu/Hub_gears.html (355 words)

	Epicyclic gearing - Wikipedia, the free encyclopedia
		Epicyclic gearing or planetary gearing is a gear system that consists of one or more outer gears, or planet gears, rotating about a central, or sun gear.
		The gear ratio in an epicyclic gearing system is somewhat non-intuitive, particularly because there are several ways in which an input rotation can be converted into an output rotation.
		For instance, if the sun gear has 24 teeth, and each planet has 16 teeth, then the ratio is -24/16, or -3/2; this means that one clockwise turn of the sun gear produces 1.5 counterclockwise turns of the planet gears.
	en.wikipedia.org /wiki/Epicyclic_gearing (957 words)

	velorution » All about hub gears
		Hub gears have been providing reliable service to cyclists since the original 3 speed model was invented and first produced by Sturmey-Archer in 1901.
		Hub gears have a transmission system inside the hub that provide between 3 and 14 gears, while on the outside the chain drives a single sprocket.
		Their hubs are also better sealed than for Sturmey Archer or Sram gears, but they are slightly less efficient, and there have been issues with the availability of spares in the UK.
	www.velorution.biz /?p=1040 (899 words)

	Modifications to Sturmey Archer Hub Gears
		The final low gear position must ensure that the sliding sun wheels are fully moved to the right to lock the right hand sun wheel to the axle.
		This low gear position appears to be a driving position but the sliding sun wheels are not fully locked and the gear is very liable to slip.
		When changing into the lowest gear it is necessary for the pedals and/or the wheel to be slowly revolving to bring the sun wheels into line with the fixed parts that lock them.
	www.users.globalnet.co.uk /~hadland/fairbrothersa.htm (937 words)

	The Moultoneer - Number 38 - Summer 1994 (Site not responding. Last check: 2007-10-31)
		Hub gears are normally used with a thicker chain.
		Curiously for a hub gear, the spring is relaxed in bottom gear.
		He continues to be satisfied with the Sachs gear and had intended to dispense with the front changer, to improve the simplicity of the system.
	www.moultoneers.net /themoultoneer/no38/super7.html (859 words)

	Ian Sims & Rohloff Speedhub 500/14
		Whereas all the other hub gears I have seen use small gears, made from powdered metal, the Rohloff gears are machined from solid alloy steel, and are about twice the size, thus they are about 4 times as strong.
		The hub steel and main cage are aluminium, the pinion axles are hollow, and a number of parts are carbon fibre.
		The hub was checked a number times, at each step in the assembly, and then EVERY hub was tested on a bench test to make sure that each of the 14 gears worked correctly.
	personal.eunet.fi /pp/davinci/rohloff-sims.html (886 words)

	Rohloff, Shimano, SRAM/Sachs and Sturmey-Archer Internal Gear Bicycle Hubs
		In the late 1990's, internal gears are undergoing something of a renaissance, with the development of wide range 7-speed hubs.
		This hub has even 13.6% steps between each of the 14 gears - the ratios are, according to the handbook:- 0.279, 0.316, 0.36, 0.409, 0.464, 0.528, 0.6, 0.682, 0.774, 0.881, 1, 1.135, 1.292, 1.467.
		I find the range of gears quite pleasant to use, and the efficiency of the hub doesn't appear to be any worse than the Sturmey-Archer FM four-speed unit it replaced.
	www.sheldonbrown.com /internal-gears.html (1022 words)

	Shimano Nexus 7-speed and 8-speed Internal Gear Hubs-Technical data
		On the right side of the hub, just outboard of the sprocket, there is a "cassette joint pulley" which the cable moves back and forth as the gears are changed.
		Both the pulley and the bracket have red index marks, and gear adjustment is correct when the marks on the two parts align with the shifter in 4th gear.
		This procedure is the same for the Nexus 4-, 7- and 8-speed hubs, using 4th gear as the reference in all cases.
	www.sheldonbrown.com /nexus-mech.html (1012 words)

	Bike gears: technology
		Hub gears use some very clever internal mechanisms to change the gear ratio between the sprocket and the wheel.
		Nowadays, SRAM/Sachs, Rohloff and Shimano have joined the fray with hubs with more than ten ratios [cutaway image of the Rohloff 14-speed hub gear].
		Hub gears have the advantage of being enclosed, without all of the exposed dangling mechanisms of the derailleur.
	tranchant.plus.com /cycling/gears/tech (262 words)

	CTC - the UK's national cyclists organisation
		The common sort of "internal gear" is a hub-gear: a compact multi-speed gearbox with all its moving parts and lubricant enclosed and protected from dirt by the rear hub shell.
		When other gears are engaged however, those tiny internal cogs rotate under load and a small amount of motive power is lost in friction.
		Internal Gear Ratios is a page of instructions and tables of data for working out how many gear inches (or metres development) you'll actually get from that hub or bottom-bracket gear.
	www.ctc.org.uk /DesktopDefault.aspx?TabID=4004 (433 words)

	hubabaloo about hub gears (Site not responding. Last check: 2007-10-31)
		To remove the sprocket (or gear as you call it), there is a round spring on the ourside surface of the sprocket which holds it onto the hub.
		Namely, when the chain is around the gear and I go to put the rear wheel back into place, the chain has no slack and it prevents me from seating the rear wheel axle all the way back into the drop outs.
		New rear hub - overhaul or not ?.
	www.bikeforums.net /archive/index.php/t-2790 (528 words)

	Internal Gears Q&A (Site not responding. Last check: 2007-10-31)
		Gears (particularly bevel gears) exhibit high frictional losses under such conditions and in tests a bicycle shaft drive was found 8% less efficient than a clean well lubricated chain transmission, or about on a par with a worn-out, dry and dirty one!
		In general, gear controls attach to the hub via quick release fittings, so that the wheel can be removed without disturbing the gear settings.
		Hub brakes are also quite often designed so that the cable anchor and casing stop can both be unhooked without undoing any fasteners.
	www.ctc.org.uk /DesktopDefault.aspx?TabID=3816 (3150 words)

	Gears
		Some bikes have hub gears: however as these are comparably uncommon in the UK and need less maintenance than derailleur systems so they are not included in this information.
		Derailleur gears use a combination of different sized front and rear chain rings with a chain that can be moved between them so that different pedalling force is required to drive the back wheel.
		Most modern gear systems will be indexed: this means that you will move the gear lever one click and the chain will shift exactly onto the next chain ring.
	www.lcc.org.uk /index.asp?PageID=643 (262 words)

	[trikes] Hub Gears (Site not responding. Last check: 2007-10-31)
		Hi Archie, The other list members have heard my views on hub gears as I have made it well known, although one list member is very passionate about staying away from them.
		Since replacing the hub gear my average speeds have increased greatly and as such I shall always steer away from them.
		My gear range with my full derailleur set-up is 17 to 92 inches and I get that with a triple chainring (30, 42, 52) and a megarange cassette (34-11).
	www.ihpva.org /pipermail/trikes/2000q4/006062.html (390 words)

	[trikes] Hub Gears (Site not responding. Last check: 2007-10-31)
		Hi All, Hub gears do indeed offer advantages over full derailleur systems, some mentioned are the lack of a chain being low to the ground and picking up grit, also all the internals away from debris and water, and the chain not moving from side to side to facilitate changes.
		I have an acquaintance who swears that the use of hub gears is essential on a commuter bike.
		It is a poor argument to defend a hybrid system with the advantages of hub gears, for the reasons outlined.
	www.ihpva.org /pipermail/trikes/2000q4/006107.html (244 words)

	42: X2 back on the road (Site not responding. Last check: 2007-10-31)
		The X2 has 81 gears (3 chainrings, 9 on the rear cluster plus 3 bub gears) and it was the hub gears within the SRAM dualdrive where we had the problem.
		We are not having hub gears anymore, so currently we have a 9 speed capreo hub/cluster at the back and have not yet changed our chainrings.
		The SRAM dualdrive is not really designed for tandems and we have put huge loads on it when towing a child (particularly on the Company of Cyclists holiday in the Cotswolds 2 1/2 years ago) or sometimes with a child on a childseat and towing a trailer or towing the Bikes at Work spine trailer.
	42.blogs.warnock.me.uk /2006/03/x2_back_on_the_.html (601 words)

	Thermoplastic Metric Gears by Spicer Industries Inc. (Site not responding. Last check: 2007-10-31)
		Economical nylon gears are available in spur gears with hub, miter gears, bevel gears, sprockets and racks.
		Gears are available in module 1 to 4 and diameters up to 200 millimeters.
		Gears are typically produced using nylon 6 with 25 percent glass fibers added that results in a tough and wear resistant gear.
	www.spicerindustries.com (172 words)

	Hub Gears Up for a Mad Halloween - Daily Nexus Online (Site not responding. Last check: 2007-10-31)
		The UCen Hub will be replacing its fast-food fixings for tea parties and mad hatters this weekend in honor of Halloween.
		The Hub's transformation from a dining facility into Wonderland will cost $3,000, all of which will be paid for by RHA and a donation from Chancellor Henry Yang, Hanna said.
		RHA Rep-at-Large and freshman dramatic arts major Sara Cogan said she promises students will not recognize the Hub once they enter the dance.
	www.ucsbdailynexus.com /print_article.php?a=8225 (443 words)

	Hub Gears feature Fairloc integral hub fastening system., Stock Drive ProductsSterl
		These very cost-effective gears are compact, self-contained and offers a small gear hub envelope.
		These gears are designed to fit shafts ranging from 1/8" to 3/8" (4 mm to 10 mm) in diameter.
		Oct 4, 2005 - Spur Gears are produced to ISO Class 7 specs.
	news.thomasnet.com /fullstory/489971/rss (810 words)

	[trikes] Hub Gears (Site not responding. Last check: 2007-10-31)
		But there are many things that can slow down a rider's performance besides hub gears, including carrying around an extra 20# even when not on the bike ;-) Perhaps the newest generation of internal hubs, the Rohloff hubs, are more efficient (ie, less lossy).
		BTW, in both cases of the internal hubs I've used, I was regularly fidgeting with adjustments as I learned how to adjust them, and as the shift cables stretched.
		When those internal transmission hubs "slip out of gear", your leg shoots out like the chain suddenly broke, and it can hurt as well as knock you off balance (2 wheeler).
	www.ihpva.org /pipermail/trikes/2000q4/006072.html (497 words)

	Acetal Spur Gears feature Fairloc integral hub fastener., Sterling Instrument
		Gears with 10 mm bores are stocked without Fairloc hubs.
		The Fairloc® integral hub fastener consists of two slots that are machined into the hub, one radially the other angularly, to create a transverse wedge which remains attached to the solid portion of the hub on one side.
		Gears with 10 mm bores are stocked hubless, without the Fairloc® hubs.
	news.thomasnet.com /fullstory/465378/rss/1620 (835 words)

	New bicycles with internal gears
		Bicycles that use internal hub gears are old fashioned and can't be found for sale as new any more.
		Anyone making a mountain bike, for example, doesn't need to include the fenders, lights, a kickstand, a carrier rack, nor a chainguard and the rear hub can be as cheap as he thinks he can supply and still have it last the duration of the one year warranty on parts.
		Too many riders are being taunted, tortured, or tamed by a bicycle that demands too much of them when a three speed or seven speed bicycle with internal hub gears would have been a better choice.
	threespeedbicycles.angelcities.com /breeszerandbiria.html (1488 words)

	BHPC Forum: Hub gears
		So tune the chainring to give a suitable 'top' end gear so the 9t cluster covers your 'normal' range but and you've got the hub-gear driven hill climbing gears for when they are needed.
		I was more comfortable with the hub gear losses this way around than with the Speed drive/ High speed drive but YMMV...
		Is the Mountain Drive hard to fit, I like the thought of a hub gear as well as the 9 speed cluster but obviously wouldn't like to risk compromising the efficiency.
	www.bhpc.org.uk /forum/forum_posts.asp?TID=94&PN=1 (440 words)

	APB Sturmey-Archer gear Masterclass (Site not responding. Last check: 2007-10-31)
		If a hub gear is ridden incorrectly adjusted and slips, damage to the internals is highly likely.
		Hub gears with oil ports should be lubricated with a light oil preferably Sturmey-Archer oil.
		This is quite different from the 3 and 5-speed hubs and quite a bit more complex and we'd suggest that you ask your dealer to do this for you unless you're keen and already a little familiar with Sturmey-Archer hubs.
	www.moultoneers.net /mcapb06.html (1768 words)

	Fixed Gear Internal Hub (Site not responding. Last check: 2007-10-31)
		A hub gear is even less efficient than a fixed gear bike.
		There was a time hub geared "club" bikes were all the rage.
		Club racing with either Sturmey-Archer hub geared or fixed gear bikes was a big deal in England and I've wanted to recreate such a bike for awhile now myself.
	www.bikeforums.net /archive/index.php/t-73801 (772 words)

	Welcome to foldingbikes.co.uk
		Reliability and durability are certainly ensured with the sealed nature of the hub gear, the quality of engineering is certainly impressive, and inarguably a step above the mass produced hub gears from other very large component manufacturers, who still haven't even come close to the 14 speed range offered by the Rohloff.
		Perhaps one of the cleverist and simplest principles of the hub is the presence of the indexing in the hub, and not the shifter.
		Options are available, with various means of fitting the hub into the frame dependant on what kind of drop out is present on the frame, as well as standard or disc brake options.
	www.foldingbikes.co.uk /rohloff_speed_hub.htm (325 words)

	RoadBike Review's Forum Archives
		Yes, the hub is pretty heavy, makes it hard to remove/replace rear wheel, and you get a little ratcheting sound in most gears, but for a slow speed cruiser like the Milano, it works well.
		With the exception of the fact that a derailleur system offers a wider range of gears, the internal hub mechanism is superior in all aspects.
		Internal hubs actually predate derailleurs, and there are more bikes worldwide with internal hubs than with derailleurs.
	archive.roadbikereview.com /00/0EE81967.php (1066 words)

	Kinetics - Reviews of SRAM hub gears
		I bought a 7 speed hub gear with hub brake to replace an SA 3 speed with hub brake.
		I had to make a concious decision to go for a gear range of 300+% tween lowest and highest versus the Shimano 7 speed hub which has a smaller gear range but the jumps between gears are not as large which can make for nicer riding.
		There is no apparent grinding on the lowest gear, the changing is precise, reliable, and the gear range is good enough for fairly steep hills but, it wont help you climb everything.
	www.kinetics.org.uk /cgi-bin/criticalreviews.pl?showreview=SRAM (517 words)

	velorution » Mechanic
		It is a very simple mechanism: the “driver” is threaded on the hubshell followed by the “clutch” and the brake shoe; so they are free to spin when pedalling or free-wheeling; then the brake shoe is followed by the reaction arm, which is secured on the frame to contrast the torque.
		Basically, the outside of the hub spins with the wheel, while the pads are held tight by the hub spindle, but that’s not enough to contrast the torque during braking, so a reaction arm is required to keep the pads firmly in place.
		While the initial cost of a drum hub is much more than a hub for rim brakes, the break-even is less than a couple of years: good-performance rim-brake pads don’t last long (less than a year if you use the bike often), and they wear the rim as well (major expense…).
	www.velorution.biz /?cat=22 (2809 words)

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