Old 80s mountain bike with rear u brake install issue.

Hi

Does anyone have experience dealing with these?

Sheldon was a bit helpful, but I need some more assistance.

I was cleaning up a recent used 80s mtn bike find and I removed the non adjustable side of the rear u brake to investigate why it was not springing back- and now I cannot seem to get it back together.

I can see how the spring fits in both of the holes with the allen bolt holding it all together, with the dust cover on top.

Does anyone have any tips that may help?

Thanks in advance, I owe you a PBR.

RB

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Permalink Reply by Kevin Mulcky on May 9, 2012 at 8:55am

Without pictures or a make/model it's pretty hard to help you over the internet.

Permalink Reply by rb on May 9, 2012 at 9:19am

thanks Kelvin

I have a 86 87 Miyata Ridge runner.

New to me but pretty beat- mix of Deore XT, suntour and whatever else. The brakes in question are Deore XT. I think that I figured it out. It seemed that turning the bike upside down, instead of on my workstand made it a bit better.

I have another (possibly related) related question though, The tires are Specialized Ground Control 26 x 1.95- though they look bigger. I am experiencing some rubbing on drive side chainstay. There is not much clearance on either side, but I am able to stop the rubbing by adjusting the quick release hub in the dropouts. The wheel is pretty true- it doesnt have a huge wobble or anything. 

Do you think the easiest thing would be to try a smaller tire? Is there a way to see if the frame is a bit tweaked in the rear triangle- is there a way to pop the frame back into alignment if that is the case.

I have read where people have spread vintage forks and frames to fit modern hardware.

This is going to be a beater/ city/ trail bike so trying to stay on a budget.

thanks in advance,

RB

Permalink Reply by Doug Haynes on May 9, 2012 at 10:04am

Pretty true is not true and that could be your issue.

Have you checked the dish on the rear wheel?  That could be your issue.

Bring the bike to a decent shop they should be able to put a gauge on it to find out of the frame is straight and there should be no charge for it.

I would say that with a 1.95 you should not have any rubbing issues.  If you can adjust the rubbing by centering the wheel though why are you even asking about it?  If when it is not rubbing the wheel is visibly not straight you have either a serious dish or frame issue.

Permalink Reply by rb on May 9, 2012 at 11:08am

Thanks Doug-I have not had an 80s mountain bike in a long time, so this is a learning process. 

I just rode a couple of miles, and I think that you are right- the wheel is out of true, as it only rubs on part of the wheel rotation. It could be a dish issue ("dishue") as well.

The 1.95 s are very tight in there anyway, might have to downsize the tires to fit some fenders. But there should be 1/8 inch roughly clearance on either side of the tire.

Thanks for the help.

Permalink Reply by Homebuilt on May 10, 2012 at 3:08am

My first "adult" bike was an 86 Miyata mountain bike, fire engine red. I'd love to see some pics of yours for nostalgia sake. I'm trying to drag up the model name.

Permalink Reply by rb on May 10, 2012 at 3:14am

Here is a pic after I brought it home

http://www.thechainlink.org/photo/miyata-ridge-runner-mid-80s?conte...

I have added an old blackburn rack, and started cleaning it up- seems to be good bike- working on dialing it in.

Permalink Reply by rb on May 10, 2012 at 6:12am
Truing the wheel helped-
My friend said that he thought the ground controls were way bigger than intended for the bike- he thought 1.5 s might work better, since there is so little clearance and might have been the original equipment. Will try that next.
Permalink Reply by Kevin Mulcky on May 10, 2012 at 6:16am

Why don't you measure the distance between the chainstays? If you can fit Panaracer Pasella 1.75s, those are great city tires.

Permalink Reply by rb on May 10, 2012 at 8:35am

Thanks for the reco Kelvin. I have heard great things about Panaracer tires. I have been wanting to try their Col de la Vie model for one of my Brit bikes.

A friend has a 1.5 used tire that he is going to let me try out. I would eventually like to get some fenders and space is at a premium.

Permalink Reply by rb on May 11, 2012 at 7:00am

I installed some specialized 1.95s, (they weren't 1.5s after all) so technically the same size, but in reality, these tires are much shorter in profile and they lack the knobbies on the Ground Controls. They seems to be working like a champ.

thanks for the ideas and conversation, everyone.

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