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1982 Miyata 610 as 650b Randonneur?

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1982 Miyata 610 as 650b Randonneur?

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Old 01-12-18, 10:50 AM
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bark_eater 
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1982 Miyata 610 as 650b Randonneur?

I've got a line on a 1982 Miyata 610. This is the precantaliver brake model with downtube shifters. I've been looking at Sports Tourers on craigslist with the idea of a low trail 650b conversion, but just as an idea.

What I do have, is hundreds of miles of country roads right starting at my driveway and a number of established long distance events that pass through every summer.

I'd like to confirm that this bike will be a good start for an all day riding bike. I weigh in at 230lbs and have a short of leg, long of back build. The I think Miyata frames are a little shorter on the top tube than the comparable Treks, but I don't know how this will translate with Randonneur bars.

The Miyata looks to have less BB drop which is good for dropping to 700c or 650b wheels, but I don't think it has a lot of tire clearance. I read that 27x 32mm tires with fenders is the limit, and being on the Clyde scale I like fatter tire.
So I'm wondering the Miyata will get me down the road with 27x32 tires, and how much of a clearance improvement will I get dropping to 700c or 650b?

Or should I keep looking for a more suitable frame?

Thanks, Woody

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Old 01-12-18, 12:40 PM
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The first thing you need to do is measure the distance from the center of the BB to the ground and then compute how much that will be reduced with 650B tires. In all likelihood it will be an ideal conversion opportunity, as are most Japanese bikes of that era.

As an example, my late 80's Schwinn Voyageur came shod with 27 X 1 3/4 tires, but it easily takes 650 X 42 Compass tires that measure out to an actual 40mm or so.

Your weight should not be an issue with properly built wheels.
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Old 01-12-18, 06:37 PM
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Going from 27”/630mm rims to 650b/584mm rims will require an additional 23mm of brake reach. That could be an issue depending on how long of a reach the original brakes have.
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Old 01-12-18, 07:06 PM
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From a quick Google survey I'm pretty sure it has been done. I would have to go back through my book marks to see if the length and model of the brakes are noted. Unfortunately just because it's possible doesn't make it a good idea.
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Old 01-12-18, 08:44 PM
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Originally Posted by bark_eater View Post
From a quick Google survey I'm pretty sure it has been done. I would have to go back through my book marks to see if the length and model of the brakes are noted. Unfortunately just because it's possible doesn't make it a good idea.
650b is always a good idea! ;P
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Old 01-13-18, 01:06 AM
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Be sure to look at these 650B conversion guidelines. In particular, check the possible tire size in both front and rear.

650B Conversion Guidlines

About the BB height - seems like lots of folks ask about that, but I don’t find that to be an issue on my own conversion, although I did switch from 175 to 170mm cranks arms, and discovered I prefer the easier spin with the shorter cranks for these 68-year old legs. I’ve never been a pedal through the corners rider anyway, even in my racing days.
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Old 01-13-18, 09:26 AM
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Good link, dfrost. I find that I don’t pedal so much through tight turns. What has caught me is pedaling over rough stuff and catching roots, rocks and irregularities.

Use bikeman’s guides and see just how big you can go. It is important to compare what the max size tire is. I don’t know what the biggest tire size is for a 610, but touring bikes typically had large clearances for bigger tires and fenders.

I would also consider a 27” to 700c conversion. This is much more easily done and it is easy to find tire sizes. I have done this on a number of bikes and easily got clearance for 38mm tires.

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Old 01-13-18, 02:18 PM
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Nice bike, go 27 to 700 with Panaracer gravelkings.
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Old 01-13-18, 08:41 PM
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I think i would be happy with 700x38's and fenders.
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Old 01-19-18, 04:03 PM
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Well... I brought this bike home.. Probably paid more than '"market value" but I did pretty much chase down the nice flipper who got there first, and made him sell me his new toy.... it needs some cosmetic work and some mechanical fettling, but before hanging it in the garage ceiling project queue, I confirmed that my $10 650B wheelset has the same axle spacing. So my proof of concept won't be much more of an investment to get on the road.
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Old 07-30-18, 04:16 AM
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I'm nearing the completion of converting my Miyata 710 (1984) into 650b. I was riding it in its natural form heaps as a gravel bike with 28c tyres. Pretty smooth and stable but was prone to punctures if I was going hard and not dodging potholes. I've fitted Tektro long drop brakes which fit the 650b wheels perfect. The wheels are modern spacing so I have 'cold set' the stays to fit the spacing. Simple procedure that I looked up on youtube. Wheels I sourced through my LBS, they are basic but well made and are double walled and sealed bearing.
By my measurements I could have just fit 42c tyres but went for 38c's to allow for mud and crap. Using Soma B-Lines tyres. Looking at a chart I found online, end wheel diameter will only be 12mm smaller than a 700 x 25c setup. Barely noticeable. My bike already had 170mm cranks, so I doubt there will be any pedal strike.

I will post up some pictures once done if you see this and want to see the finished product.

Last edited by darcybuck; 07-30-18 at 04:20 AM. Reason: Addition
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Old 08-04-18, 11:01 PM
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Originally Posted by darcybuck View Post
I'm nearing the completion of converting my Miyata 710 (1984) into 650b. I was riding it in its natural form heaps as a gravel bike with 28c tyres. Pretty smooth and stable but was prone to punctures if I was going hard and not dodging potholes. I've fitted Tektro long drop brakes which fit the 650b wheels perfect. The wheels are modern spacing so I have 'cold set' the stays to fit the spacing. Simple procedure that I looked up on youtube. Wheels I sourced through my LBS, they are basic but well made and are double walled and sealed bearing.
By my measurements I could have just fit 42c tyres but went for 38c's to allow for mud and crap. Using Soma B-Lines tyres. Looking at a chart I found online, end wheel diameter will only be 12mm smaller than a 700 x 25c setup. Barely noticeable. My bike already had 170mm cranks, so I doubt there will be any pedal strike.

I will post up some pictures once done if you see this and want to see the finished product.
I wanna see it!
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Old 08-05-18, 05:21 AM
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The first bike I converted to 650B was a Miyata built Univega. You should be able to fir 650Bx38 tires with fenders, and Weinmann /Dia-Comp 750 , or Mafac Raids should have enough reach if sidepulls don't. Miyatas usually have a higher bottom bracket so pedal strike shouldn't be a problem. If you really like the bike and want another modification, have a builder braze on centerpull posts for the brakes.
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Old 08-05-18, 07:35 AM
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This one is at the local co-op and would probably go for less than $50. I think there's a dent in the seat tube. Not my size or I'd have brought it home.

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Old 08-07-18, 02:53 AM
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Unfortunately I can't post pictures as I'm only a newbie. I will load them up as soon as able. Very happy with the outcome. Rides beautifully and opens up a huge range of roads around my local area.
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Old 08-09-18, 12:30 AM
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Ok, I'm just going to write a nothing post here so that I clock over enough posts to show off my beauty. Sorry, but I keen to show you all what is achievable........
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Old 08-09-18, 12:37 AM
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Only lost about 6-7mm ride height. Not really an issue as this frame has a high BB.



38c Soma B-line tyres. Brake levers are retro TRP RRL's. They look similar to the original Dia-compe but with a modern shape which I find far more comfortable.


Clearance at the chainstays is only a couple of millimeters either side with 38c fitted. Brakes are Tektro long reach versions. Added bonus is that they are dual pull offering far better braking.
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Old 08-09-18, 04:43 AM
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Very nice. I got distracted with other projects but It looks like the Miyata 610 will stay"period correct" with 27'' wheels for a bit and the 650b wheels will go on a Miyata 110 that I tore the derailleur off of.

And things were going so well (warning graphic images)

Since its going to have "I did it myself" metal work, brazing and paint touch up, I'm going to dimple the stays to get 42mm tires fit while I'm at it and keep my eyes open for donor forks to try my hand at fork re-raking.
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Old 08-09-18, 04:58 AM
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bark_eater
Didn't do the stays but did braze on a lower rear brake bridge and re-rake the fork on an old Malvern Star frame I had a while back. Good experience, learnt heaps from doing it. Even if my methods were a bit agricultural.
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