Thinking again of getting new wheels, and have been vexing over the OLN size. Am I correct in thinking that the correct rear OLN measurement may be obtained by measuring the distance between the two inside edges of the rear dropouts ?
Seems that I have 130mm OLN, which is good. But apparently rather unusual, as the bike came with a 7 speed gears (on a freewheel) ..
-- George H.W. Bush, as Presidential Nominee for the Republican party; 1987-AUG-27: "No, I don't know that Atheists should be considered as citizens, nor should they be considered as patriots. This is one nation under God."
Thinking again of getting new wheels, and have been vexing over the OLN size. Am I correct in thinking that the correct rear OLN measurement may be obtained by measuring the distance between the two inside edges of the rear dropouts ?
That's the idea, but it may not always actually be exactly what it's supposed to be......
Quoted message said:
Seems that I have 130mm OLN, which is good. But apparently rather unusual, as the bike came with a 7 speed gears (on a freewheel) ..
In message <[email hidden]>, Chesney Christ <[email hidden]> writes
Quoted message said:
Hi all,
Thinking again of getting new wheels, and have been vexing over the OLN size. Am I correct in thinking that the correct rear OLN measurement may be obtained by measuring the distance between the two inside edges of the rear dropouts ?
Yep.
Quoted message said:
Seems that I have 130mm OLN, which is good. But apparently rather unusual, as the bike came with a 7 speed gears (on a freewheel) ..
Is that unusual? You don't say what the bike is 'road' bikes tend normally have 130mm OLN even nowadays with a zillion sprockets and have done so for some time. -- Chris French, Leeds
A certain chris French, of uk.rec.cycling "fame", writes :
Quoted message said:
Quoted message said:
Seems that I have 130mm OLN, which is good. But apparently rather unusual, as the bike came with a 7 speed gears (on a freewheel) ..
Is that unusual? You don't say what the bike is 'road' bikes tend normally have 130mm OLN even nowadays with a zillion sprockets and have done so for some time.
This is a Dawes Giro 200 from two years ago (road bike).
Apparently 126mm is the common size for a 7 speed road bike, going by ol' Sheldon's site. I guess my bike comes from the time when 7 speeds were already fading into obscurity 🙂
-- George H.W. Bush, as Presidential Nominee for the Republican party; 1987-AUG-27: "No, I don't know that Atheists should be considered as citizens, nor should they be considered as patriots. This is one nation under God."
"Chesney Christ" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Thinking again of getting new wheels, and have been vexing over the OLN size. Am I correct in thinking that the correct rear OLN measurement may be obtained by measuring the distance between the two inside edges of the rear dropouts ?
Seems that I have 130mm OLN, which is good. But apparently rather unusual, as the bike came with a 7 speed gears (on a freewheel) ..
I think its outside edges -- but wait for confirmation from an expert.
Surprisingly, my ancient Galaxy (with a 6 speed freewheel) is 130mm (by my definition -- would be even more by yours).
A certain Tony W, of uk.rec.cycling "fame", writes :
Quoted message said:
"Chesney Christ" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Thinking again of getting new wheels, and have been vexing over the OLN size. Am I correct in thinking that the correct rear OLN measurement may be obtained by measuring the distance between the two inside edges of the rear dropouts ?
Seems that I have 130mm OLN, which is good. But apparently rather unusual, as the bike came with a 7 speed gears (on a freewheel) ..
I think its outside edges -- but wait for confirmation from an expert.
Sheldon says :
"The distance between the outermost locknuts of a conventional hub axle, or whatever equivalent parts fit against the inside surfaces of the fork ends of a frame. They must match the spacing (see chart) of the frame that the wheels are to be installed in. "
It's the locknuts on mine that press against the inside edges whenever the quick-release is tightened.
-- George H.W. Bush, as Presidential Nominee for the Republican party; 1987-AUG-27: "No, I don't know that Atheists should be considered as citizens, nor should they be considered as patriots. This is one nation under God."
"Chesney Christ" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Sheldon says :
"The distance between the outermost locknuts of a conventional hub axle, or whatever equivalent parts fit against the inside surfaces of the fork ends of a frame. They must match the spacing (see chart) of the frame that the wheels are to be installed in. "
It's the locknuts on mine that press against the inside edges whenever the quick-release is tightened.
There again, on a steal frame a few mm between friends is unlikely to be a problem.
"Tony W" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
I think its outside edges -- but wait for confirmation from an expert.
OLN = over lock nuts
And its easy to work out it's not the outside - imagine if your dropouts were suddenly made twice as thick by putting material on the outside, thus increasing the outside edge distance. Obviously the wheel would still fit in exactly the same way (you may need a slightly longer skewer (or axle if bolted)).
Chesney Christ <[email hidden]> wrote in message news:<[email hidden]>...
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Apparently 126mm is the common size for a 7 speed road bike, going by ol' Sheldon's site. I guess my bike comes from the time when 7 speeds were already fading into obscurity 🙂
Some 7sp. threaded road hubs are 130mm, such as the Hope ones; these are convertible by altering the positions of certain axle spacers. Oh, and remember to get the wheel re-dished if changing between 8sp. and 7sp. formats; I found that one out the hard way :-(
A certain David E. Belcher, of uk.rec.cycling "fame", writes :
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Some 7sp. threaded road hubs are 130mm, such as the Hope ones; these are convertible by altering the positions of certain axle spacers. Oh, and remember to get the wheel re-dished if changing between 8sp. and 7sp. formats; I found that one out the hard way :-(
Can you expand on that - why is this necessary ?
-- George H.W. Bush, as Presidential Nominee for the Republican party; 1987-AUG-27: "No, I don't know that Atheists should be considered as citizens, nor should they be considered as patriots. This is one nation under God."
In message <[email hidden]>, Chesney Christ <[email hidden]> writes
Quoted message said:
A certain David E. Belcher, of uk.rec.cycling "fame", writes :
Quoted message said:
Some 7sp. threaded road hubs are 130mm, such as the Hope ones; these are convertible by altering the positions of certain axle spacers. Oh, and remember to get the wheel re-dished if changing between 8sp. and 7sp. formats; I found that one out the hard way :-(
Can you expand on that - why is this necessary ?
Presumably , when modifying the hub for 8 speed, you need to swop some spacers over from the non-drive side to the drive side to give enough space for the slightly wider 8 speed cassette.
This effectively moves the flanges of the hub where the spokes attached towards the non -drive side and if you didn't redish the wheel, then the rim would end up out of centre. -- Chris French, Leeds
A certain chris French, of uk.rec.cycling "fame", writes :
Quoted message said:
Presumably , when modifying the hub for 8 speed, you need to swop some spacers over from the non-drive side to the drive side to give enough space for the slightly wider 8 speed cassette.
This effectively moves the flanges of the hub where the spokes attached towards the non -drive side and if you didn't redish the wheel, then the rim would end up out of centre.
I get it. This is obviously only a concern when someone is retrofitting an existing 7 speed hub with an 8/9 speed freehub body. Phew!
-- George H.W. Bush, as Presidential Nominee for the Republican party; 1987-AUG-27: "No, I don't know that Atheists should be considered as citizens, nor should they be considered as patriots. This is one nation under God."
chris French <[email hidden]> wrote in message news:<[email hidden]>...
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This effectively moves the flanges of the hub where the spokes attached towards the non -drive side and if you didn't redish the wheel, then the rim would end up out of centre.
Absolutely - as such, the rear wheel won't quite follow the same line as the front one; I was unaware of this at first as the wrongly dished (my own blunder) 7-to-8 speed conversion was fitted to a bike with horizontal dropouts. Probably explained the tendency to wobble at speed, though, culminating in escaping serious injury on a descent of Garrowby Hill. The problem only really came to light when swapping the same wheel over to my 'cross bike, which has vertical dropouts. Lo and behold, it didn't fit properly....
