|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
rebuilding my wheel
leow wrote: *I'd go with 3 cross - 4 cross wont work unless you re-drill the rim holes at an angle. * Quoting myself... You can see what I mean about 4 cross not being a good idea on a small rim. http://www.unicyclist.com/gallery/albun41/P1010017 The nip*les emerge at 90 deg but the spokes bend away towards the hub. This makes it a pain to tension and introduces a weak spot. If you use a larger flange hub like a suzue I'd use 2 cross. Leo White -- leow - Unicycling oldbie TO I WHEEL - my favourite anagram ------------------------------------------------------------------------ leow's Profile: http://www.unicyclist.com/profile/981 View this thread: http://www.unicyclist.com/thread/27460 |
Ads |
#12
|
|||
|
|||
rebuilding my wheel
leow wrote: *http://www.unicyclist.com/gallery/albun41/P1010017 The nip*les emerge at 90 deg but the spokes bend away towards the hub. This makes it a pain to tension and introduces a weak spot. If you use a larger flange hub like a suzue I'd use 2 cross. Leo White * These are my pics and are placed in the gallery precisely for the opposite reason -- to show that 4x on a trials uni is practical. There is not any additional work or trouble to tension this wheel. It does involve spoke path correction, but that's normal for any wheel (you do spoke path correction, don't you?). There is nothing weak about it; this wheel has done at least 3 foot drops and tons of stairs with no problem whatsoever -- no loss of trueness or damage of any sort. If you read the literature you will see that the angles between nipple and spoke are common and straightforward. Redrilling the spoke holes would accomplish nothing because the seating for the nipple flange would not change. 2 cross in a trials wheel is not a good idea, however; the minimum I'd use is 3 cross. -- U-Turn - Mounting a Revolution Weep in the dojo... laugh in the battlefield. 'Strongest Coker Wheel in the World' (http://www.unicyclist.com/gallery/albup39) -- Dave Stockton ------------------------------------------------------------------------ U-Turn's Profile: http://www.unicyclist.com/profile/691 View this thread: http://www.unicyclist.com/thread/27460 |
#13
|
|||
|
|||
rebuilding my wheel
evilewan -- The Monty rim is notorious for pulling through the rim. The Alex is not. leow -- That's cool that you figured out how to relace a giraffe wheel without unwelding. I'm expecting to build my first here soon. The advice I currently have is to build the wheel, then attach the sprocket and weld. Do you think it would be possible to build the wheel after welding? -- U-Turn - Mounting a Revolution Weep in the dojo... laugh in the battlefield. 'Strongest Coker Wheel in the World' (http://www.unicyclist.com/gallery/albup39) -- Dave Stockton ------------------------------------------------------------------------ U-Turn's Profile: http://www.unicyclist.com/profile/691 View this thread: http://www.unicyclist.com/thread/27460 |
#14
|
|||
|
|||
rebuilding my wheel
do you really have to weld it to the hub? what we always did was weld the cog to a freewheel, weld the freewheel in place, and then loc-tite the frozen freewheel to the hub. we've never had one spin off after loc-tite and the apropiate drying time. however I think we've had a couple cog's welds break on the freewheel... but those are easier to replace. and if that makes any sense. -- Max_Dingemans - Hey Look, who's that? "And when the sky darkens and the prospect is war Who's given the gun and then pushed to the fore And expected to die for the land of our birth Though we've never owned one lousy handful of earth" ------------------------------------------------------------------------ Max_Dingemans's Profile: http://www.unicyclist.com/profile/1981 View this thread: http://www.unicyclist.com/thread/27460 |
#15
|
|||
|
|||
rebuilding my wheel
I had the same trouble that Ewan had - spokes erupting through my Monty rim. My solution was to rebuild the wheel with a Profile hub and Alex DX32. I just picked up my rebuilt trials unicycle wheel 1/2hr ago. The spoke calcuator on unicycle.uk.com was right on the money for spoke length (177.47mm predicted for 3-cross; 177mm actually used.) The guy who rebuilt my wheel said that reason spokes were pulling through the rim was likely to be because of pedal grabs putting extra stress on the wheel. Has anyone else experienced the spoke nipples pulling thru their Monty rim problem -without- doing pedal grabs? If so then we know that it's a problem with the Monty rim itself, rather than how the rider treats it. Tony Melton -- TonyMelton - NZUNi The first NZUNi Weekend - October 25-27, Wellington. More info at 'www.unicycle.co.nz' (http://www.unicycle.co.nz) New videos in 'My Photo Gallery' (http://gallery.unicyclist.com/albur10) added on 22nd July. ------------------------------------------------------------------------ TonyMelton's Profile: http://www.unicyclist.com/profile/2118 View this thread: http://www.unicyclist.com/thread/27460 |
#16
|
|||
|
|||
rebuilding my wheel
*likely to be because of pedal grabs putting extra stress on the wheel. * It seems to me a little thought shows that this is incorrect. What is a pedal grab? + A hop + an unloaded 90 degree rotation to get pedal in place + landing on platform with weight on pedal + side-to-side unloaded balance motions + unloaded 90 degree rotation to get foot on other pedal + pull on seat and hop up to rubber + landing on platform after ~ 1 foot unloaded hop + subsequent micro-hops for balance. See, there is nothing here to stress the wheel any more than riding along the sidewalk or the height of the initial hop. It seems to me that the Monty design is flawed. They should have used either eyelets or thicker material around the spoke holes. Since the Monty tire is infamous for not fitting the Monty rim well, we could surmise that the design process in general was not up to, say, the Alex design process in terms of quality. -- U-Turn - Mounting a Revolution Weep in the dojo... laugh in the battlefield. 'Strongest Coker Wheel in the World' (http://www.unicyclist.com/gallery/albup39) -- Dave Stockton ------------------------------------------------------------------------ U-Turn's Profile: http://www.unicyclist.com/profile/691 View this thread: http://www.unicyclist.com/thread/27460 |
#17
|
|||
|
|||
rebuilding my wheel
i do loads of grabs on my unicycle, not to mention grinds and drops while hopping on the wheel. i suspect that in general its unicycle trials which put extra stress on the wheel. although grabs dont put extra stress on the wheel, i suspect that the wheel dosent particularly like the sideways impacts it gets when you grab onto uneven obstacles, or screw up. i`ve got plenty of scratches on the braking surface to atest to it. even so, im sure that the main stresses that my wheel gets a 1. big drops badly 2. drops hopping on the wheel, this means that you always land witht the wheel at an angle like this / -- evilewan - death or glory -- evilewan. see the rec.sport.unicycling maintainance FAQ @ http://evilewan.unicyclist.com/ ------------------------------------------------------------------------ evilewan's Profile: http://www.unicyclist.com/profile/1047 View this thread: http://www.unicyclist.com/thread/27460 |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
wheel rebuilding question | Gary Smiley | Techniques | 14 | July 28th 04 10:41 AM |
"The Stability of the Bicycle" | GerryK | Techniques | 168 | October 22nd 03 05:02 PM |
MA3 rim failure, where to now | B | Techniques | 258 | October 10th 03 08:46 PM |
idling and wheel sizes | Mikefule | Unicycling | 16 | August 19th 03 07:29 AM |