Axle spacers or offset rear wheel?
Hey gang,
I replaced a 7 speed freewheel with an 8 speed one and had to put an axle spacer on the freewheel side to keep it from rubbing against the dropout and now the wheel is offset to the left a little. Is it better to have the wheel offset and have the hub properly rest in the dropout on the non-freewheel side, or should I find another spacer to have the wheel centered in the frame? The offset is looks to be about 3mm. Thanks! |
First, redo the drive side spacing such that the distance from the freewheel stop to the end of the lock nut is 40.5mm. 41mm is okay.
Then, finish off the non-drive spacing so that you have an OLD of 134-136mm. (This is assuming your rear spacing is supposed to be 135mm). Then re-dish the rear wheel - i.e., center the rim between the ends of the lock using a dishing tool to check... =8-) |
Thanks... I'm not sure what OLD stands for, also the rear spacing isn't 135, it's 126.
|
Stuffing #8 cog in a 7 speed frame requires more dishing , greater tension imbalance..
much better to spread the frame dropouts, so hubshell centerline is moved rightward. not leftward.. |
Originally Posted by SlowCrank
(Post 14576316)
Thanks... I'm not sure what OLD stands for, also the rear spacing isn't 135, it's 126.
Do you have any idea just how much worse you've made the asymmetry of the rear wheel? Commonly rear 126mm 6/7 speed offsets are: 36 non-drive 20 drive side Now you've probably made it: 40 non-drive 16 drive side It you are going to stick with your new setup, I strongly recommend cold-setting your rear to 130mm. ...and then add a 4mm spacer to the non-drive side of the hub along with a longer axle to create a 130mm rear hub. This way you can bring the non-drive side offset back down to around 36mm... Otherwise you are going to have very loose non-drive tension (much like some old Maillard wheels) and increase the risk of non-drive spoke breakage at the heads. =8-) |
Le sigh, OK... thanks for the pointers... It's starting to sound like I've bitten off more than I can chew.
|
Originally Posted by SlowCrank
(Post 14576316)
Thanks... I'm not sure what OLD stands.
It's the distance between the outside edges of your hubs two locknuts. In a perfect world it should also match your bike frame's dropout spaceing. |
As mentioned, the result is a wheel that isn't what we'd call "good".
However, if you aren't too heavy and are somewhat easy on the wheel, it can still work. I've stuffed a 9 speed into my 126MM spaced RockHopper and use it. However, I only use it on smooth pavement and avoid driveway lips etc. in any manner that gives a severe "jolt". What you want to do is use the LEAST amount of spacer possible on the DS. Add as much spacer on the NDS as possible that will still allow you to force the wheel between the dropouts. IF you can find lock nuts with the "beveled" corners, that helps. Your Free Wheel won't be a standard distance from the drop out, so you won't be able to swap a wheel in and have the RDER line up properly, since it has to be set to utilize a different area of travel. Ditto about swapping your "custom" wheel into another bike. Another draw back of your conversion is that the axle is even more likely to bend, since the unsupported distance between the bearings & frame is even greater. Not good if you are a "hefty" rider or hit pot holes. |
have a missing ratio of gears that makes #8 so important.?
Or, just get an Alfine Internal 8speed hub instead .. that builds into a less dished wheel |
I would like to ask the same question as the OP in order to recycle a found on the shelf wheel that is in really great shape (like new)..
Hub is a Shimano HF-05 (without the drumbrake threading often seen on these) Cassette is 7-Speed Shimano OLD is 135mm Axle is Q/R Desired change is to replace the current 7spd cassette with a: New SRAM 11-34 9spd cassette I have all the other bits on the shelf to shift it, etc. So the question is what do I need to do to the wheel and how best to do it? Thanks in advance for any assist /K |
Frame dropouts spread for the 135 wide axle?.. or what?
|
Originally Posted by SlowCrank
(Post 14576316)
Thanks... I'm not sure what OLD stands for, also the rear spacing isn't 135, it's 126.
|
Originally Posted by ksisler
(Post 15295906)
I would like to ask the same question as the OP in order to recycle a found on the shelf wheel that is in really great shape (like new)..
Hub is a Shimano HF-05 (without the drumbrake threading often seen on these) Cassette is 7-Speed Shimano OLD is 135mm Axle is Q/R Desired change is to replace the current 7spd cassette with a: New SRAM 11-34 9spd cassette I have all the other bits on the shelf to shift it, etc. So the question is what do I need to do to the wheel and how best to do it? Thanks in advance for any assist /K Isn't it also spaced for 145MM? |
Originally Posted by Bill Kapaun
(Post 15296531)
That probably has a 7 speed Free Hub body which is too short for cassettes with >7 speeds. Isn't it also spaced for 145MM?
Another poster suggested the wheel might already be 9spd (due to the large OLN) but with a 7spd cassette installed, but with a spacer behind the current cassette to space it out? It does look like there is about 3/16" or 1/4" of black metal showing behind the cassette up against the alloy of the hub when I was expecting to see about 1/16" lip of the body. And there is plenty of space between the big sprocket and the spokes and also between the little sprocket and the dropout. Thus it just might be already a 9spd read hub. It would be good luck landing on me...would be a welcomed change. The wheel is cleanly 135mm OLN. The frame I want to put the revised wheel into was factory 135mm, not a stretched or bent into 135mm. /Just another day or two! /K |
To determine if freehub is 7 or 8/9/10 is easy:
Using calipers, or quality ruler....measure spline stop to outside of the locknut. 40.5-41mm = 8/9/10 speed 39.00mm = 7 speed 36-37mm = 6/7 speed (pretty old really) --\ <---- measure ----> ------------------- ..........................| ..........................|---| ..........................|....|XX ..........................|....|XX ..........................|---| ..........................| ------------------- --/ =8-) |
Please ignore, as the previous post answered this... I just didn't see it in time...
Originally Posted by mrrabbit
(Post 14576148)
First, redo the drive side spacing such that the distance from the freewheel stop to the end of the lock nut is 40.5mm. 41mm is okay. Then, finish off the non-drive spacing so that you have an OLD of 134-136mm. (This is assuming your rear spacing is supposed to be 135mm). Then re-dish the rear wheel - i.e., center the rim between the ends of the lock using a dishing tool to check... =8-)
Could you also provide that spec for the other variations? I am thinking about a formerly 7spd Shimano hub wanting a SRAM 11-34 9speed cassette, as that is my current issue at hand (apologies for being self-centerer), but the spec for any or everything you happen to have knowledge of would likely be very welcome. Thanks (and apologies for being so tardy in reading this thread). /K |
Originally Posted by Bill Kapaun
(Post 15296531)
That probably has a 7 speed Free Hub body which is too short for cassettes with >7 speeds.
Isn't it also spaced for 145MM? Is there a viable solution such as a specific longer body available to replace it. Is there a recommended part number or source? The wheel is NOS Wheelsmith build 135mm 48-spoke tandem wheel I am desiring to repurpose and currently it is perfectly dished and well tensioned. A replacement 40-spoke wheel of simlar quality is currently running $300-ish, so I would like to avoid buying new but also want to avoid making the current wheel less that robust. Any advice on best way forward and/or sourcing for a longer hub would be welcomed. /K |
Originally Posted by ksisler
(Post 15314193)
Please ignore, as the previous post answered this... I just didn't see it in time...
Mr R; I don't think I have seen that spec before... Seems like it would be useful to a lot of folks posting here. Could you also provide that spec for the other variations? I am thinking about a formerly 7spd Shimano hub wanting a SRAM 11-34 9speed cassette, as that is my current issue at hand (apologies for being self-centerer), but the spec for any or everything you happen to have knowledge of would likely be very welcome. Thanks (and apologies for being so tardy in reading this thread). /K Splined 7-speed freehub bodies and narrower than splined 8/9/10 freehub bodies and both are complemented with differing size axle-end finishing lengths. Non-drive side is used to finish out the desired OLD spec. =8-) |
IF you already have the 9 speed shifters, one option is to use 8 of 9 on 7.
http://sheldonbrown.com/k7.html#up7 scroll down a bit- |
Originally Posted by Bill Kapaun
(Post 15314413)
IF you already have the 9 speed shifters, one option is to use 8 of 9 on 7.
http://sheldonbrown.com/k7.html#up7 scroll down a bit- I stacked up the new 9spd cogset on the existing freehub...even 8 of 9 on 7 is too tall to well engage the threads. I do think I have the "shorter" version 6/7spd vice the normal 7spd freehub. I am going to take it back apart tonight and measure the spline to lock nut distance to make sure what the beast really is, but I am suspecting its really the older 6/7 speed (36mm) Why I didn't measure that distance while I had it apart is well, unspoken. I am now attempting to identify the specifics for a replacement 9spd freehub. It might be cheaper to buy an entire used 9spd bike off craigslist to get the part given what I am seeing the prices for freehubs running ($30-47+UPS)...and would have a lot of parts left over for use elsewhere or swap and flip it back. /K |
I would just buy a 13-34T 7-speed cassette and call it a day. ;)
|
It's a bit of a crapshoot as to whether the body will fit.
I did some swapping a couple years ago, to turn a no name 7 speed hub to a 9 speed using the body off a FH-M570. I'd recently purchased a couple FH-RM30's ($20 ea. delivered for the whole hub) and tried to swap the "no name 7 speed body" to one of them to reduce dish. It didn't fit. One thing to check is the spacers. Sometimes the spacer material "extrudes" a bit around the rivet holes and has to be cleaned off with a file. Else it makes the spacers "wider" upon reassembly. |
Originally Posted by mrrabbit
(Post 15314287)
If the current freehub is a 7-speed setup, you'll have to change the freehub - if available - and swap in a 8/9/10 freehub along with a slight spacer/locknut change on the drive side as well. Splined 7-speed freehub bodies and narrower than splined 8/9/10 freehub bodies and both are complemented with differing size axle-end finishing lengths. Non-drive side is used to finish out the desired OLD spec. =8-)
/K [h=1][/h] |
All I know is the RM-30 & M570 aren't.
Hope you are luckier than me. |
2 Attachment(s)
Well I did the measurements on the existing freehub body (apologies for ragged ruler, but the backside is filed pretty accurately). Pictures below.
Seems it is 3.8mm and 4.1mm -- indicating it might be another variant of the measures provided by MrRabbit... sort of a 6/7 speed body with thicker than normal spline stops?? Pretty sure it is a real Shimano HF05 hub, but who knows what year it was actually built? Anyone have ideas one way or the other? If it werent a fairly expensive item to replace, I might file back the spline stops by 1.5mm and retest the SRAM-9 cogset to see if I can get an adequate spline capture for all the cogs... or "8 of 9 on a 9" http://bikeforums.net/attachment.php...hmentid=301492 http://bikeforums.net/attachment.php...hmentid=301493 |
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