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necessaries for swapping freehubs

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necessaries for swapping freehubs

Old 04-10-17, 03:44 PM
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thook
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necessaries for swapping freehubs

hello all,

i have two wheelsets. one has a 7spd hub with 130mm spacing and the other has an 8spd hub spaced at 135mm. i'd like to swap freehubs between the wheels. from what i'm reading, all i'd have to do is swap axles w/spacers and then the freehubs, accordingly. is that correct? both are shimano. i'd also have to redish the wheels; the new 8spd over to the DS 2mm and the new 7spd over to the NDS 2mm. correct?

this is what i'm understanding from my searches. i just to make sure i'm not mistaken and going set myself up for a problem before i proceed.

thank you!
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Old 04-10-17, 04:19 PM
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Bill Kapaun
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If You mentioned which Free Hubs, one might be able to see if the FH bodies are compatible with the hub.

Don't forget the DS cone goes with its specific FH body.

Spacers might be inconsistent between hubs. That is, the 135 doesn't "automatically" have a spacer that's exactly 5mm longer than the equivalent spacer on the other hub.

IF these are Shimano, what are the Hub model#'s.
One could look at the tech docs to see if they use some of the same parts.
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Old 04-10-17, 06:16 PM
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thook
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Originally Posted by Bill Kapaun View Post
1)If You mentioned which Free Hubs, one might be able to see if the FH bodies are compatible with the hub.

2) a)Don't forget the DS cone goes with its specific FH body.

b)Spacers might be inconsistent between hubs. That is, the 135 doesn't "automatically" have a spacer that's exactly 5mm longer than the equivalent spacer on the other hub.

3)IF these are Shimano, what are the Hub model#'s.
One could look at the tech docs to see if they use some of the same parts.
1) well, the 7spd hub is an early 90's deore dx, and the 8spd hub is a current model deore, if that tells you anything.

2) a)again, my plan is to move everything from one hub to the other...sans the seals and wheelhub itself, of course. so, yes...the DS cone will go with it's specific FH body.
b) not sure what you're driving at here. in light of my reply for 2a) what factor am i over looking? iow's, if i'm moving all hardware over with it's original FH, why wouldn't the axle spacing transfer over, as well? does the
hub body itself also affect the spacing or something?

3) i don't know the model numbers offhand. i'll have to retrieve that info this evening. wonder if there even be any tech docs on a hub as old as that dx?
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Old 04-10-17, 06:38 PM
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1. No
See the link for exploded drawings with part#'s for the various Free Hubs.
https://www.paul-lange.de/index.php/...ichnungen.html

2. Hubs are not identical across the Shimano line. Cones vary widely in thickness and other details.
There is some interchangeability and some parts that simply aren't.
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Old 04-10-17, 09:52 PM
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thank you, bill. i'll give all that info a look and report back. i was really hoping for something to be simple. jury's not out yet, though. finger's crossed!
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Old 04-10-17, 10:33 PM
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the deore hub info is there, and it does not list the dx as being compatible. however, the dx hub is not even listed on the page of pdf's. FHM590 = deore FHM650 = deore dx. but, now i see what you're talking about in regards to parts and possible incompatibilities, though.

i'll poke around the web and see if i can find any tech docs on the dx. ultimately, i may just have to leave the hubs alone, make my 8spd cassette a 7spd...dropping the 11t...and regear the crank. but, since i'm still too curious to give up, i will probably go ahead take'em apart and see anyway despite not having a definitive from the outset. hmm...didn't really want to do it that way, but oh well. if it doesn't work out, i'm not gonna try and make it work, so to speak.

oh!...when i was out gathering model no.'s, i noticed there's a fair amount of the right hand lock nut unit sticking out past the cassette on the dx freehub. maybe 5mm's or more? certainly more than on the 8spd hub and cassette. the cassette's almost flush with the hex on that. so, i'm wondering if perhaps someone had an 8spd hub on there and swapped it to a 7spd before selling it to me. i got'em on ebay a while back.

anyway....thanks, again!
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Old 04-10-17, 11:12 PM
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Probably a little tinkering, but you'll be close.
I've done a few freehub swaps, and there are a few differences among Shimano freehubs, but many of them are close.

Go ahead and remove the freehubs, and see what is behind them. Seals and spacers? If all else fails, reassemble, and service the bearings.
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Old 04-10-17, 11:16 PM
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You'll probably be OK.
The earlier versions were "more compatible" for FH body swaps.
Some newer versions have a totally different spline/FH body interface. (see FH-RM30 for example)
You might have to use some different thickness spacers to get it "correct", but there is a bit of room to fudge a mm or 2?
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Old 04-10-17, 11:19 PM
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thanks, clifford. probably won't have time to do anything until the weekend, but i'll report back. i did just find a thread on another forum wherein the fellow did run his 130mm spaced dx hub with a 9spd cassette. so, i see it's doable. just not maybe the way i'd wanted to...ie, the swap.

btw, the bearings are all in perfect shape. i swear this dx wheelset looks almost brand new...which is why i got it. trek titan tour 36h rims, wheelsmith spokes, and sparkly slim dx hubs with brand new looking seals. the sidewall on one rim has some abrasion around it, but it doesn't look to be from a brake pad. not sure what it's from.
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Old 04-10-17, 11:57 PM
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Originally Posted by Bill Kapaun View Post
You'll probably be OK.
The earlier versions were "more compatible" for FH body swaps.
Some newer versions have a totally different spline/FH body interface. (see FH-RM30 for example)
You might have to use some different thickness spacers to get it "correct", but there is a bit of room to fudge a mm or 2?
thank you, once again! i'll keep that all in mind. encouraging...
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Old 04-11-17, 02:41 AM
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I've done a couple of those.


IME the actual cone part - where the balls run - of the DS cones are identical, but the way the seal/dust shield interact with the fh body can differ in several ways. Bringing the DS cone + spacers + seal along with the fh body tend to give the best/easiest result.
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Old 04-11-17, 01:56 PM
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okay. the seals do look very similar upon a general look over of that area. thanks!

first thing i'm going to do is simply see if the 8spd FH will fit without any other transfers. again, there looks to be enough room for it in regards to the OLN.

Last edited by thook; 04-11-17 at 02:22 PM.
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Old 04-11-17, 02:55 PM
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Originally Posted by thook View Post
.....make my 8spd cassette a 7spd...dropping the 11t.........
Will NOT work. You can drop the big cog, but not the 1st position (smallest cog). The 1st position cog has a spacer in unit with the cog; the others do not. When you take apart a cassette, it will be obvious.
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Old 04-11-17, 03:02 PM
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i know it won't work they way you're describing. drill the rivets out, drop the 11t (and original 13t) and install an outer 13t from a different cassette. done it before. works well if it's just the outermost cog...not quite as well if it's a cog middle of the cassette.

in fact, if this does work out, i'm going to mod the 8spd 11-30 to 13-34 and put a larger outer ring on up front.

Last edited by thook; 04-11-17 at 03:25 PM.
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