Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the July Giveaway for a brand new 26" Thruster® Street Style BMX Cruiser Bicycle

New product launch: WIN an innovative aeroe Spider Rear Rack

Downtube Shifters on 1991 Miyata 721

I am trying to fix up my 1991 Miyata 721 and part of those repairs involves the shifters. The old shifters broke off and now all there is is a simple hole thru the downtube of the frame without any kind of threading. I got some new downtube shifters (Shimano SL-A500) but have had no luck finding the bolt-on bosses. I've also looked at getting some clamp on shifters but most look to be 28.6mm and mine roughly measures to around 32mm.

The shifters should look like this: https://simplicityvintagecycles.files.wordpress.com/2016/05/miyata_721_05.jpg

Thank you all.
Hello there.
From what I understand, you will need a downtube shifter mount. Yours has to be 31.8mm.
(06-05-2020, 01:37 PM)G_M Wrote:  Hello there.
From what I understand, you will need a downtube shifter mount. Yours has to be 31.8mm.

Damn, I was trying to avoid using this kind of bulky and plastic mount but from the looks of it I might have to. Have not found anything else suitable. Thanks for your help.

Possibly Related Threads...

Forum Jump:

10 Latest Posts
budget speedometer
Today 02:44 AM
26" Thruster® Street Style BMX | July 20...
Yesterday 06:40 PM
Post a photo for aeroe Spider Rear Rack
Yesterday 01:33 PM
Biking inUtah
Yesterday 10:25 AM
Requested question
07-13-2020 11:20 PM
Ceramic Oversize Pulley
07-13-2020 11:07 PM
RD Alignment
07-13-2020 03:40 PM
2020 road cycling season
07-13-2020 02:55 PM
Taylor Phinney retires
07-13-2020 02:54 PM
Axle is clunky/not spinning smoothly, is...
07-13-2020 12:06 PM

Top 5 Posters This Month
no avatar 1. Jesper
78 posts
no avatar 2. CharleyFarley
24 posts
no avatar 3. Papa Dom
10 posts
no avatar 4. Painkiller
8 posts
no avatar 5. Sagan97
7 posts