Topic: Wheel runout question

[smccloud]

Ok,
Some of you may remember me asking for help relacing my rear wheel.  I have that done and am now in the process of truing it up using a tire crayon; or at least getting it close for now until I can "borrow" my dad's dial indicator.  I know the dial indicator is best, but I could afford the tire crayon and trust my dad when he says I can do it using it.  That and for some reason I am pretty decent at measuring the distance between the crayon and rim as its spinning.  What is the max distance I should shoot for when setting the runout using this (crappy) method?  I know its been mentioned before, but i can't find it now........

[shoemanII]

trued both my rims to between 1 to 1.25mm in both directions but it took awhile, 'cause it was my first time.  i trued up/down first, then side to side.  am sure my poor wife got tired of hearing tink, tink, tink, tink, tink, tonk, tink, tink, tink, etc. 

good luck, be patient and step away if need be.  don't forget to oil your nipples!  (hey, somebody had to say it).
bobp         

[bryanj]

Max of 1/8 inch (3mm) for both up and down and side to side.
Forget the dial indicator its WAY too accurate

[chippyfive50]

you'll go mad with the dial unless you started with a fresh round rim...I'll second the 1/8th!

[troppo]

don't forget to oil your nipples!

cant beat the feel of oiled nipples

[merc2dogs]

 I'll say go for the 1/8th too.
  A lot of people can't detect anything less than 1/4 inch out either way, and a lot of what you can detect depends on the suspension. I aim for 1/16th just because I can. You don't need perfect concentricity.

 My prefferred 'tools' are my finger and a sharpie, or dry erase marker, rough it in using my finger as a gauge, then use a sharpie for fine tuning.
 Have several dial indicators and agree, they're far too accurate and more difficult to use. With a sharpie they leave a visible mark, so you know what needs tightened where. That speeds up the whole process. mark, adjust, wipe it off and go again till you're happy with the results.

Ken.

[crazypj]

about 3mm side to side max and 2mm up and down, MOT is 1/8"
 You WILL feel vibration with this amount off run out, even at 40~50 mph (forget the misleading 'most people cant feel less than 1/4 run out".)
 Your 'crappy method' will get you to within 0.010"~ quite easily as long as you don't go nuts tightening spokes in one place only (and remember to loosen opposite if you need to rather than snap spokes)
 If you haven't used a dial indicator previously its not the easiest thing to use.
You can see the effect of a quarter turn on nipple and it may not be in direction or place you wanted so can actually be a distraction.

PJ

[smccloud]

ok, i'm at around 1mm side to side.  probably more up and down though.  i will "borrow" one of my fiance's sharpies tonight since i can hold that closer to steady using the chain guard than i can the tire crayon on the outside of the rim.

[LoopsAndLogic]

Not to hijack your post, but does anybody know what the run out on a 400F should be in inches?
 I'm finally at ease using my dial indicator.

They work great! And just to let you know, you can get a really nice and accurate one at Harbor Freight.

Cheers,

LL

[smccloud]

Not to hijack your post, but does anybody know what the run out on a 400F should be in inches?
 I'm finally at ease using my dial indicator.

They work great! And just to let you know, you can get a really nice and accurate one at Harbor Freight.

Cheers,

LL

probably the same as for a 750.  just convert the mm to inches (25.4mm in one inch).

as for me, i got it all done tonight.  put the tire on then noticed the *(^*(& arrow was on backwards.  I pulled the tire off, put it back on and damned if i didn't wreck my brand new tube

sense i am not sure how much riding i will get in before i order a new set of tires (gonna replace the front to try to get rid of a nasty shake when i let off the gas) i just put a can of fix-a-flat in it for now even though the can said not to.  come "economic stimulus" check time i will order a new set of tires, two new tubes, and a new set of rim straps because knowing my luck i wrecked the back one too.  the one thing that worries me is the minor vibration at 65mph or so, but that could be due to the fix-a-flat as well......

i do have to say that riding when it's 40 degrees out gets very chilly and requires the choke to be left on.

[shoemanII]

be very careful about that "nasty shake when i let off the gas".  that's a classic description of headshake.  unless you or the PO has dropped the forks in the trees, you may have loose/worn steering head bearngs. 
bobp

[smccloud]

be very careful about that "nasty shake when i let off the gas".  that's a classic description of headshake.  unless you or the PO has dropped the forks in the trees, you may have loose/worn steering head bearngs. 
bobp

i think its due to the front tire having been on a yamaha xs650 before it went on my honda (not known for its good front tire wear).

i think the vibration is due to my dumbass not switch gears when i went from measuring axial runout on the inside instead of the outside of the rim.  i proceded to tighten the spokes where the sharpie marked the rim, instead of loosening those and tightening the other ones.

[crazypj]

Not to hijack your post, but does anybody know what the run out on a 400F should be in inches?
 I'm finally at ease using my dial indicator.

They work great! And just to let you know, you can get a really nice and accurate one at Harbor Freight.

Cheers,

LL

With a DTI you can easily ge to 0.010" or better
PJ

[smccloud]

well, i rode into work today.  got a little chilly at 36 degrees, and the vibration that appears at 65 doesn't leave by 80 either   i think i need to do a little more work truing the wheel up.

[crazypj]

Check wheel/tyre balance.
Rears are often overlooked for balancing but tthey have a major effect on handling
PJ

[smccloud]

Check wheel/tyre balance.
Rears are often overlooked for balancing but tthey have a major effect on handling
PJ

i will worry more about that when i get a new rear tire.

[mystic_1]

Have you checked the condition of your wheel bearings?


mystic_1

[smccloud]

Have you checked the condition of your wheel bearings?


mystic_1

yep, fine.  there was no vibration 'till i relaced the wheel (and put fix-a-flat in the tube due to my dumbass not being able to mount the tire correct).

[mystic_1]

In that case I'd definitely suspect that fix-a-flat, I've never liked that stuff.

Also, check to make sure the tire is mounted straight, most tires have a molded line on the sidewall near the bead, there should be an even gap between this and the rim all the way around, on both sides.

When mounting tires, I like to inflate them to around 5 lbs and then bounce them a number of times, turning the wheel a bit each time.  This seems to help things settle in before inflating to proper pressure.

mystic_1

[smccloud]

In that case I'd definitely suspect that fix-a-flat, I've never liked that stuff.

Also, check to make sure the tire is mounted straight, most tires have a molded line on the sidewall near the bead, there should be an even gap between this and the rim all the way around, on both sides.

When mounting tires, I like to inflate them to around 5 lbs and then bounce them a number of times, turning the wheel a bit each time.  This seems to help things settle in before inflating to proper pressure.

mystic_1

yeah, dennis kirk is only like 90 miles from me and they offer free tire mounting with new tires