need help with tire / chainstay clearance issue. pics included.

B

beltbuckle

New Member
So I am putting on Maxxim Hookworms (26 x 2.5), mounted on Husky 26 x 2.125 rims, on a 1955 AMF Roadmaster frame.

The issue is that the tire needs more clearance near the front of the bottom chainstay where it tapers in to the bottom bracket. The tire was rubbing but I trued it up a little and now there is 1-2mm of clearance. I need a little more clearance.



chainstay_prb

So option 1 is to grind/notch the inside of the chainstay tubes, and weld in some kind of reinforcement.

Option 2 would be easier but wanted to get some feedback. If I could just move the tire back 1/4" it would help quite a bit with the clearance issue. So I thought I could just drill some holes and elongate the slot where the hub mounts, like this.

slot (unmodified)

chainstay_orig


proposed modification:


chainstay_mod


Anyone see any problem elongating this dropout slot a bit?
 
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yeah i have considered that but making new dropouts is a lot of work considering i only need to move the tire back less than 1/2"
 
Well if it was my bike (and situation, which it's not) I would spend the extra dollars and invest in 24" rims and run the 24"x2.5" Hookworms and save the leftovers for a future build. I understand you may be on a limited budget as most people are, but that is what I would do. A cheaper and equally acceptable option would be to elongate the drop-outs as you already know and Joe emphasized........a good solution.

The other solution would be to run 1.9" tires.......not quite the same results however. Have at it ;)

dnut
 
yeah, hindsight being 20/20 and all... that probably would have been the better way to go. but after dropping the cash for the hookworms and the husky wheels, sturmey archer hub, etc. got to make it do.

On to the next problem!
 
beltbuckle said:
yeah, hindsight being 20/20 and all... that probably would have been the better way to go. but after dropping the cash for the hookworms and the husky wheels, sturmey archer hub, etc. got to make it do.

On to the next problem!
Click to expand...

Here's a little food for thought: http://motorbicycling.com/showthread.php?t=32789&page=20

Yes, all problems can and will be solved......that's half the fun of building these creations.

.wee.
 
Thanks Scotto. Finally got my tubes in and tires mounted and the seat came in. starting to look like a bike again. as soon as my sportsman crankset comes in i can start getting the engine mount figured out.


20120521_074627.jpg



Love these hookworms! They have some amazing grip.
 
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looks to me like you will need to spread your tail section a bit, also. Not too difficult to do.
the bicycle tubing bend really easy. bend it out at the very front, for the sidewall clearnce, then back in again to fit your hub dimensions.
rc
 
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