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#1
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Read if you have Rollo Disks
Hi All, There are a couple of issues I'm currently having to sort out with the Rollo disks. Issue #1: Standard Moment axle bolts appear to be too short to have sufficient thread depth on installation of the production disks. Issue #2: The disks may have been manufactured in two pieces with a disk pressed into the hole in the middle. They were supposed to be machined in one piece. For those of you that have already received one, it would be appreciated if you could hang tight for a few days while I try to sort this out. Don't install them as tightening the axle bolt with too few threads may damage your hub. Thanks for your patience and sorry about the hassle. Kris -- danger_uni ------------------------------------------------------------------------ danger_uni's Profile: http://www.unicyclist.com/profile/21 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
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#2
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Read if you have Rollo Disks
OK- it looks like the 2nd issue was a false alarm. That's a relief. However, it looks like there has been one posted disk where the middle was broken by severely tightening the axle bolt. This would take a huge amount of twisting force on that section. I am a bit baffled about how it could occur as the inset shouldn't be under that much force. Note that in general there isn't the same need to tighten axle bolts ultra tight as there is with 4-square-taper cranks. Again though- don't install until I've sorted out the issue of getting longer axle bolts. Kris -- danger_uni ------------------------------------------------------------------------ danger_uni's Profile: http://www.unicyclist.com/profile/21 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#3
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Read if you have Rollo Disks
The KH Ti hubs have bolts long enough for them. It is possible that the 08/09 hubs are long enough as well, but I will wait until Kris agrees before I say that definitely. -- ntappin 'how to build a strong comfy saddle from junk.' (http://tinyurl.com/hxcb3) ------------------------------------------------------------------------ ntappin's Profile: http://www.unicyclist.com/profile/10800 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#4
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Read if you have Rollo Disks
the bolts that came with my 08 kh longneck (not ti hub), aren't long enough. -- surfer1024 *)--SmallSpin-'O,* 1st Place)---hickflip-'O, Latest Vid: 'Man's Best Friend' (http://www.unicyclist.com/forums/showthread.php?t=72409) #f5f5f5 ------------------------------------------------------------------------ surfer1024's Profile: http://www.unicyclist.com/profile/13733 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#5
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Read if you have Rollo Disks
There are very slight manufacturing tolerance variations when making ISIS splines. As long as you are within the ISIS-defined standard, that's completely normal. Because ISIS splines are tapered, the result is that some cranks go on very slightly further than others. It's possible that those of you that have ones that fit simply have cranks that fit slightly further onto the splines. But again- if it looks like you are just catching 1 or 2 threads, you shouldn't try tightening the axle bolt because you run the risk of stripping the hub threads. There is a small gap between the back face of the Rollo disk and the end of the axle, because the cranks never 100% completely go all the way onto the axle. Because of this gap, it appears that if you work hard enough at it you can tighen the axle bolt so much that it breaks the back face of the disk. However, this much pressure is not needed to keep your cranks secure. As long as you just tighten the axle bolt to firm hand pressure, that's enough. For those people accustomed to the old 4-square-taper hubs, this is way less pressure than was needed with those hubs. Kris -- danger_uni ------------------------------------------------------------------------ danger_uni's Profile: http://www.unicyclist.com/profile/21 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#6
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Read if you have Rollo Disks
Hi All, Extra-long axle bolts have been ordered in Taiwan at 25 mm length (the current axle bolts are 18 mm). As soon as their made, I'll air-ship bolts to all the importers who currently have Rollo disks; they can send them on to everyone who already bought them and are waiting on the bolts. That should take about a month. Starting next Spring, all Nimbus and KH ISIS hubs will come standard with the longer bolts so will all be compatible with the Rollo disks. Thanks for your patience! Kris -- danger_uni ------------------------------------------------------------------------ danger_uni's Profile: http://www.unicyclist.com/profile/21 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#7
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Read if you have Rollo Disks
danger_uni;1146633 wrote: Hi All, Extra-long axle bolts have been ordered in Taiwan at 25 mm length (the current axle bolts are 18 mm). As soon as their made, I'll air-ship bolts to all the importers who currently have Rollo disks; they can send them on to everyone who already bought them and are waiting on the bolts. That should take about a month. Starting next Spring, all Nimbus and KH ISIS hubs will come standard with the longer bolts so will all be compatible with the Rollo disks. Thanks for your patience! Kris Yay! -- surfer1024 *)--SmallSpin-'O,* 1st Place)---hickflip-'O, Latest Vid: 'Man's Best Friend' (http://www.unicyclist.com/forums/showthread.php?t=72409) #f5f5f5 ------------------------------------------------------------------------ surfer1024's Profile: http://www.unicyclist.com/profile/13733 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#8
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Read if you have Rollo Disks
One question- If over-tightening the crank bolts can shear the thin inner section of the disk, how will this design be affected by the stresses of normal use? It seems that any weight that the rider places on the rollo disk is transfered through that thin material. Also, since the center of the rollo disk will not contact the end of the axel (in most cases), that weak spot also bears the force needed to keep the crank snugly fastened to the hub. It seems that even if the force does not immediately shear the disk there may be enough force to stress the aluminum and result in a less sudden premature failure. If I am correct, this could be prevented by thickening the material slightly, or by providing spacers to fill the gap between the inside face of the disc, and the end of the axel. Could this be a valid concern? -- OneWheelLess Seriously, the other wheel just fell off one day. ------------------------------------------------------------------------ OneWheelLess's Profile: http://www.unicyclist.com/profile/16793 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#9
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Read if you have Rollo Disks
The shelf that the bolt face sits on is not actually that thin at about 4.5 mm - enough that it should be more than strong enough for the appropriate axle bolt torque. The disk contains an insert section that slides into the crank to support lateral force when standing on it; again lots of metal for flat riding. If you keep the Rollo disk on the cranks and hit it hard during a big grind, you could break it. It's in a pretty vulnerable place. But of course, the point of the disk is to take cranks that are good street and trials cranks and turn them into good flatland cranks. If you are going to try something that might really smash it, just take it off. -- danger_uni ------------------------------------------------------------------------ danger_uni's Profile: http://www.unicyclist.com/profile/21 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#10
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Read if you have Rollo Disks
danger_uni;1146742 wrote: If you keep the Rollo disk on the cranks and hit it hard during a big grind, you could break it. It's in a pretty vulnerable place. But of course, the point of the disk is to take cranks that are good street and trials cranks and turn them into good flatland cranks. If you are going to try something that might really smash it, just take it off. With all respect, I don't think people will take the rollo disk off when they will do a grind or stall etc. To much hassle. So expect some breaks after a few months. -- Probailer2 Sponsored by www.municycle.com JJuggle wrote: If somebody cloned your mother would you have sex with the clone? I should think not. Danni wrote: I don't like having penis written all over my uni . manon1wheel wrote: no offense but deads look plain old gross... ------------------------------------------------------------------------ Probailer2's Profile: http://www.unicyclist.com/profile/11034 View this thread: http://www.unicyclist.com/thread/74648 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
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