New gears for the Ironman
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New gears for the Ironman
I recently picked up an 88 Ironman Master that I want to make some improvements to the gearing. It currently has a 12-21 cassette and I want something more like a 12-28. Apparently these originally came with a 13-24 so it may not be original. The hub is an HF6400 on a Mavic MA40 rim so I know the rim is not original. There's no name on the cassette, just 7s L1 on the smallest gear. This is my first dealings with a cassette, all my bikes use a freewheel. What do I need to look for in deciding on a new cassette?
#2
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That cassette doesn't look like anything I've seen before. If it's Shimano compatible this will work:
https://www.jensonusa.com/SRAM-PG-73...QaAgROEALw_wcB
https://www.jensonusa.com/SRAM-PG-73...QaAgROEALw_wcB
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That cassette doesn't look like anything I've seen before. If it's Shimano compatible this will work:
https://www.jensonusa.com/SRAM-PG-73...QaAgROEALw_wcB
https://www.jensonusa.com/SRAM-PG-73...QaAgROEALw_wcB
The pic of the back of the cassette doesn't look right so here's a better one.
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I recently picked up an 88 Ironman Master that I want to make some improvements to the gearing. It currently has a 12-21 cassette and I want something more like a 12-28. Apparently these originally came with a 13-24 so it may not be original. The hub is an HF6400 on a Mavic MA40 rim so I know the rim is not original. There's no name on the cassette, just 7s L1 on the smallest gear. This is my first dealings with a cassette, all my bikes use a freewheel. What do I need to look for in deciding on a new cassette?
That cassette doesn't look like anything I've seen before. If it's Shimano compatible this will work:
https://www.jensonusa.com/SRAM-PG-73...QaAgROEALw_wcB
https://www.jensonusa.com/SRAM-PG-73...QaAgROEALw_wcB
If it was my bike and the wheel was in good shape I’d find a good used 7spd Hyperglide hub and transfer that axle set and freehub body to the wheel. The 7spd Hyperglide cassettes are easier to source
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You're all correct, I removed the whole hub body from the hub. I removed a cassette before but there was a lock ring which this one does not have. Do I need to use two whips to remove the first cog? I only have one. Is there another way?
So this one is a Uniglide?
So this one is a Uniglide?
#7
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You can do it with one chain whip if you've got a bench vise. You can just clamp it in the vise & use the chain whip. Or, clamp a sacrificial piece of chain in the vise & around the cassette & use a chain whip.
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I'll give it a try, thanks. I've gained a better understanding of what I have and what I need thanks to the help here. I think I'll probably take Bianchigirl's advice and replace the hub.
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But just the freehub body and axleset yes? unless the bearing race on the left is worn.
If it was my wheel I'd use something like this to harvest the freehub body and axleset https://www.ebay.com/itm/Shimano-STX...0AAOSw74xdw6cJ
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Is the RD A 62 series or 64 series. If you go to the IM thread, i put some how to guides there about how big of a rear cluster a 62 series RD will shift. I started the how to guides about the time the virus started shutting down. There should be info there to answer all of your questions.
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Is the RD A 62 series or 64 series. If you go to the IM thread, i put some how to guides there about how big of a rear cluster a 62 series RD will shift. I started the how to guides about the time the virus started shutting down. There should be info there to answer all of your questions.
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A 640X RD will reliably shift a 28 tooth cog; I would not advise going larger unless using a Wolf Tooth extender.
There are 12 tooth UG first cogs out there but they are rare and relatively expensive.
Agree that installing an HG freehub will make it easier to find the cog sizes you want.
There are 12 tooth UG first cogs out there but they are rare and relatively expensive.
Agree that installing an HG freehub will make it easier to find the cog sizes you want.
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#13
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I recently picked up an 88 Ironman Master that I want to make some improvements to the gearing. It currently has a 12-21 cassette and I want something more like a 12-28. Apparently these originally came with a 13-24 so it may not be original. The hub is an HF6400 on a Mavic MA40 rim so I know the rim is not original. There's no name on the cassette, just 7s L1 on the smallest gear. This is my first dealings with a cassette, all my bikes use a freewheel. What do I need to look for in deciding on a new cassette?
#14
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You'll need one on the larger cogs to prevent them from spinning when you use the second one to loosen the smallest cog which is the locking cog. I just did it with one chain whip by carefully placing the cassette in a vice. Luckily it wasn't real tight and unscrewed with not a lot of force. Don't know if that's the norm though.
#15
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You'll need one on the larger cogs to prevent them from spinning when you use the second one to loosen the smallest cog which is the locking cog. I just did it with one chain whip by carefully placing the cassette in a vice. Luckily it wasn't real tight and unscrewed with not a lot of force. Don't know if that's the norm though.
Last edited by WildWilly; 07-16-20 at 12:21 PM.
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A couple days ago I knew nothing about cassettes, but it's really very easy once you've done it.
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Wow looks great Would enjoy hearing an update on how you like the gearing vs the UG. What is your typical daily ride like? Going to have to find that thread from seypat.
You're looking for page 336 of the "post your Centurion Ironman" thread. @seypat did a great job.
#20
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Here's my Ironman with a big 12-32 Sram cassette on it. I took the easy route and just put a brand new 130mm wheel set on it with some Microshift brifters and a long cage 105 RD.
This is a
Centurion.
This is a
Hill Climbing
Last edited by ramzilla; 07-16-20 at 08:08 PM. Reason: Clarification............
#23
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A brand new wheelset solves a lot of drivetrain problems. New rear wheel will always have a freehub preinstalled. All you need to do is decide how many cogs you want + get shifters to match. 7 speed is still my favorite because it's the most economical. . But, 130mm rear spacing fits 8 & 9 speed just as well. It's all good. Have fun.