Replace Shimano mf-hg37 cassette
#1
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Replace Shimano mf-hg37 cassette
Hello bike experts: I am trying to replace the cassette for my Trek 3700. My existing cassette is a Shimano MF-HG37 13-28t, which I can't find new anywhere. I bought a Shimano CS-HG200-7 12-28t but it won't fit on the existing HG37 hub body. The HG37 uses a variable diameter hub body with wave-shaped spines whereas the HG200-7 requires a uniform diameter hub body with rectangular spines.
What hub body does the HG200 require? Are the threads compatible with the HG37? Any other suggestions on how to restore my bike?
Thanks,
Bob
What hub body does the HG200 require? Are the threads compatible with the HG37? Any other suggestions on how to restore my bike?
Thanks,
Bob
#2
Senior Member
Join Date: Sep 2005
Location: Oakland, CA
Posts: 3,265
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked 1,205 Times
in
701 Posts
Hmm, the part number MF-HG37 matches up to a freewheel. Is that what you have? Here is a reference: https://www.sheldonbrown.com/free-k7.html
...and a pic from the reference below. If you really need a freewheel, then you can search eBay for "shimano tourney freehwheel 13-28" and you should get some relevant results.
...and a pic from the reference below. If you really need a freewheel, then you can search eBay for "shimano tourney freehwheel 13-28" and you should get some relevant results.
#3
Senior Member
Join Date: Sep 2005
Location: Oakland, CA
Posts: 3,265
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked 1,205 Times
in
701 Posts
If it turns out you need a freewheel, Sunrace also makes a nice 13-28, which I am using on one of my bikes.
#4
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Thanks for the reply. I studied that tutorial before buying or posting and, as I understand it, mine is a cassette. After removing the lock-ring, the rear cogs can be removed individually, leaving just the variable-diameter hub body. Unfortunately, as a newbie, I am not allowed to post my photos nor links...
#5
Senior Member
Join Date: Sep 2005
Location: Oakland, CA
Posts: 3,265
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked 1,205 Times
in
701 Posts
Thanks for the reply. I studied that tutorial before buying or posting and, as I understand it, mine is a cassette. After removing the lock-ring, the rear cogs can be removed individually, leaving just the variable-diameter hub body. Unfortunately, as a newbie, I am not allowed to post my photos nor links...
Did the process you followed look something like this: https://restoringvintagebicycles.com...ewheel-part-i/
And did the part left on the hub look like this?
#7
Senior Member
Join Date: Sep 2005
Location: Oakland, CA
Posts: 3,265
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked 1,205 Times
in
701 Posts
Sorry, I'm of no further use without pictures. As far as I know, there was no one-off Shimano standard beside freewheel and freehub. There was Uniglide before Hyperglide, but Uniglide was very similar to Hyperglide, and in the part number you gave, HG refers to Hyperglide.
On the upside, this back and forth is helping you get your post count up. Once you get to 10 (limited to 5 per day for new members), you can then post pics!
On the upside, this back and forth is helping you get your post count up. Once you get to 10 (limited to 5 per day for new members), you can then post pics!
Last edited by noobinsf; 01-21-20 at 01:39 PM.
#8
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Yep, getting that post count up!
Just revisited the official shimano page for the MF-HG37 and they refer to it as a "Multiple Freewheel" (hence, one presumes, the "MF" in the part number). But otherwise it seems to fit the description of a freehub cassette per Sheldon Brown's excellent reference.
Just revisited the official shimano page for the MF-HG37 and they refer to it as a "Multiple Freewheel" (hence, one presumes, the "MF" in the part number). But otherwise it seems to fit the description of a freehub cassette per Sheldon Brown's excellent reference.
#9
Senior Member
Join Date: Sep 2005
Location: Oakland, CA
Posts: 3,265
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked 1,205 Times
in
701 Posts
Yep, getting that post count up!
Just revisited the official shimano page for the MF-HG37 and they refer to it as a "Multiple Freewheel" (hence, one presumes, the "MF" in the part number). But otherwise it seems to fit the description of a freehub cassette per Sheldon Brown's excellent reference.
Just revisited the official shimano page for the MF-HG37 and they refer to it as a "Multiple Freewheel" (hence, one presumes, the "MF" in the part number). But otherwise it seems to fit the description of a freehub cassette per Sheldon Brown's excellent reference.
#10
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Thanks. I am more and more convinced that you gave me the right answer with your first reply, but I had worked hard to convince myself that mine was a cassette/freehub system, so it's taking some effort to unconvince me. Clearly it's pretty out-dated...
#11
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
After revisting Sheldon Brown's tutorial, I have definitively determined via the "spin test" that the MF-HG37 is indeed a freewheel. The removable sprockets on the splined body had me believing otherwise, but it looks a lot like the Shimano Hyperglide Freewheel photo from the tutorial. The lock ring I removed is the one the photo caption says "it is never necessary to remove".
So, the Shimano MF-TZ21 14-28t looks to me like a good replacement, as does the Sunrace 13-28t you mentioned.
Thanks again for your help. If you're interested in seeing the photos of my disassembled freewheel, I'd be happy to keep chatting until I reach 10 posts.
So, the Shimano MF-TZ21 14-28t looks to me like a good replacement, as does the Sunrace 13-28t you mentioned.
Thanks again for your help. If you're interested in seeing the photos of my disassembled freewheel, I'd be happy to keep chatting until I reach 10 posts.
#12
Senior Member
Join Date: Sep 2005
Location: Oakland, CA
Posts: 3,265
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked 1,205 Times
in
701 Posts
After revisting Sheldon Brown's tutorial, I have definitively determined via the "spin test" that the MF-HG37 is indeed a freewheel. The removable sprockets on the splined body had me believing otherwise, but it looks a lot like the Shimano Hyperglide Freewheel photo from the tutorial. The lock ring I removed is the one the photo caption says "it is never necessary to remove".
So, the Shimano MF-TZ21 14-28t looks to me like a good replacement, as does the Sunrace 13-28t you mentioned.
Thanks again for your help. If you're interested in seeing the photos of my disassembled freewheel, I'd be happy to keep chatting until I reach 10 posts.
So, the Shimano MF-TZ21 14-28t looks to me like a good replacement, as does the Sunrace 13-28t you mentioned.
Thanks again for your help. If you're interested in seeing the photos of my disassembled freewheel, I'd be happy to keep chatting until I reach 10 posts.
#14
Senior Member
Join Date: Sep 2005
Location: Oakland, CA
Posts: 3,265
Bikes: '82 Univega Competizione, '72 Motobecane Grand Record, '83 Mercian KOM Touring, '85 Univega Alpina Uno, '76 Eisentraut Limited
Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 1088 Post(s)
Liked 1,205 Times
in
701 Posts
Neither team stuck with its city. They are dead to me. I'm not so much into sports for sports' sake, more for civic pride. I do love an A's game or a Giants' game on a sunny day.
#15
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
My wife and I followed the Panthers out to see them get massacred by the 49ers at Levi's in Oct. Disdain for the stadium and location seemed almost universal among the fans, but I enjoyed visiting my old SJ stomping grounds from my years in the integrated circuit biz. Saw the Giants play at candlestick in '74...
#17
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
My local bike shop had the part in stock. They removed the old freewheel and installed the new one at no additional charge. By saving me the cost of the removal tool, it was actually cheaper than Amazon.
#18
Junior Member
Thread Starter
Join Date: Jan 2020
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Here are my photos from my disassembled old freewheel, the MF-HG37.
28 tooth cog from MF-HG37
"hub body" from MF-HG37, showing "wave-shaped" splines and variable diameter
28 tooth cog from MF-HG37
"hub body" from MF-HG37, showing "wave-shaped" splines and variable diameter
Likes For BC6260: