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Old 12-21-09, 01:24 PM   #1
badger_biker 
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Anyone use a Shimano MF-HG40 "MegaRange" 7-speed freewheel?

I have a 13/30 7 speed freewheel on my Voyageur and it sticks occasionally so I want to replace it and lower my gearing. If anyone has used the MF-HG40 could you tell me the cog sizes? All I can find on the web is that it is 14-34 but nothing about the inner cog sizes.
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Old 12-21-09, 02:58 PM   #2
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The cassette version and the freewheel version have different cogs.
The freewheel version is 11-13-15-18-21-24-34
I used one with single c-ring on a commuter bike and loved it. However, I would think that the 24T-34T jump would be awkward for a touring triple.
I almost never used the 34 because the jump was way too abrupt.
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Old 12-21-09, 03:27 PM   #3
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I have a 13/30 7 speed freewheel on my Voyageur and it sticks occasionally so I want to replace it and lower my gearing. If anyone has used the MF-HG40 could you tell me the cog sizes? All I can find on the web is that it is 14-34 but nothing about the inner cog sizes.
We switched the stock cluster on my wife's Jamis Trail-X 1.0 to the 7 speed Megarange and with the 34 tooth gear, she doesn't have to go into the "granny" chainwheel unless we are "loaded" for touring and heading up mnt. passes but she LOVE's the 34 tooth gear with the 34 tooth middle chainwheel. (Note: we've converted our MTB's into more road worthy touring hybrids, to do overnite and weekend road tours out of Colorado Springs, CO. FYI)
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Old 12-21-09, 04:52 PM   #4
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I have a Mega 14-34 on my Opus Urbano of a winter bike.
The cogs are: 14, 16, 18, 20, 22, 24, 34.

I'd love to find a 9 speeds with a similar spread for the first 8 speeds and one 'get-out-of-trouble' mega-cog for touring. Close speeds are just nice to pedal, much more than a stupid 11-34 as the current HG-50.

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Old 12-21-09, 07:21 PM   #5
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JeanM, you can always make a custom cassette if you wish. Harris Cyclery has some prebuilt custom cassettes and you can order just the cogs you need.
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Old 12-21-09, 08:25 PM   #6
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Thanks for the suggestion.
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Old 12-22-09, 01:07 AM   #7
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http://www.rivbike.com/products/show...ewheels/13-091
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Old 12-22-09, 09:05 AM   #8
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I was curious about these freewheels as well. Can anyone compare the Shimano Megaranges w/ the IRD freewheels? I guess my biggest question is the 34T cog on the Shimano vs. the 32T on the IRD. Big enough of a difference to make a..well, difference? I'm leaning towards the IRD but I like the larger 34T cog on the Shimano.

Anyone ridden both and able to compare them?
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Old 12-22-09, 12:24 PM   #9
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At the time I was looking to change around my drive train I had a choice of going Mega or switching the crank. IRD was on Version I of their free wheel (not good). After chatting with the LBS and trying the mega on a friends walmart bike I started leaning towards cranks. 48-36-24

If IRD does not source in china I'll use them as my next replacement but 13-28 shimano are easy to find and at > 20 bucks a pop, new chain/freewheel as needed.

Note: I use 36x28 a lot and it's -easy- to find with friction shifters
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Old 12-29-09, 04:21 PM   #10
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I have used several of the Mega-Range freewheels. I think there where two versions, one that had a 24-34 jump and one that had a 26 or 27-34 jump I thought. I cold be wrong. I still have one. I also have a pretty new Nashbar-version (probably IRD I would guess) that has like 50 miles on it. I liked using the Shimano version with a 52-34 crank and rode that setup for about 3-4 years. It was great to have that "bailout" gear, but it *is* a heck of a jump.

If you want, I'll dig both of them up for you to try out - both are freewheel versions, not cassettes. (one- Shimano, one-Nashbar).
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Old 12-29-09, 05:48 PM   #11
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I actually decided to go w/ the Shimano 7 speed Megarange the other day. Found a new one for really cheap on eBay, figured it was worth a shot. If it's too much of a jump I'll try an IRD.
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Old 12-30-09, 08:52 PM   #12
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Thanks for the info on the 14/34. I ordered one from Niagara and will see how it works. I have a 28-42-50 crank so that should give me some good midrange gears and a pretty low granny. Unfortunately the crank is a biopace so I can't go as low as I would like.
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Old 02-20-10, 09:54 AM   #13
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I mounted the 14-34 Shimano the other day.. only to find.. the rear railer won't get the chain onto the 34 cog. I knew it was iffy.. just misses.

Have to say.. the 14 16 18 20 22 24..34.. is one nice gearing... with 52/40 front.. in the wintertime.. with clothes.. boots et al. 22 and 24 is still lower than my other 13-21... which will likely go back on come summer.
That one is 13 14 15 16 17 19 21.. super into strong head winds.

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Old 02-20-10, 10:02 AM   #14
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I ended up having trouble getting my rear der. to work w/ it as well. I adjusted it enough so I can hit the big cog if i'm on the lower cog up front, but it won't make the jump on the bigger chainrings. not a big deal really, i normally wouldn't be using w/ that gear combination anyways..
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Old 02-20-10, 08:12 PM   #15
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I did some work on a friend's bike today with the mega and a Deore XT RD and encountered pretty much the same issues. Seemed a bit of a struggle to get it on the 34 from the middle front ring but worked pretty good from the granny. It was just in the stand so not sure how it will be on the road when the snow goes. He has brifters so I'm hoping my V'ger with bar ends will make it a little easier to force the chain up on the big cog.
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Old 02-21-10, 04:40 AM   #16
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Quote:
Originally Posted by emarg0ed View Post
I was curious about these freewheels as well. Can anyone compare the Shimano Megaranges w/ the IRD freewheels? I
2 years ago I joined some folks for a Blue Ridge Parkway tour using a 7 speed Nashbar Mega range 13-32. The jump on the up shift from 32 to 24 was too abrupt. Try to visualize yourself climbing a gradual grade in your middle chain ring in your bottom 32 or 34 tooth cog. The grade starts to lessen as you approach the top and you want to shift up slightly and your only choice is one step up to a 24! Or you fumble around looking for an even step up using your granny chain ring. I replaced it with the evenly spaced IRD 13-32 freewheel. It's jump from 32-28 is more agreeable. I have a freewheel threaded Phil Wood hub that's not ready to replace so I don't have the option of the more numerous choices you get with cassettes.

Last edited by BobG; 02-21-10 at 05:17 AM.
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Old 02-21-10, 10:09 AM   #17
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I figure the jump from 24 down to 34 is gonna be a jolt.... figured I'd carry say 15-20' of aluminum logging chain.. never know when a stump needs pullin'.

How to define a 'hill'.... mine to date is a .4 mile climb up I'll guestimate 75'.... the last .25 the steepest. I've got this one done several times with the 21... haven't tried the 14-34 on it. My main reason for the 34 is as a bailout.. got stopped one day on some short very steep "hills" where I had to mash to get over them from a near dead stop... not great for the knees. The 34 will allow me to climb most anything.. albeit used little. Walking the bike doesn't go with me.

Sans some electronic gadget.. is there a simple way to figure the height of said 'hill'? Map data somewhere on the net?
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