How to change rear tire on a Nexus 8? (Please help!)

Lobo Tommy

I've got a Trek Navigator 400 with the next Nexus 8 hub and the
documentation has NO instructions on how to change the rear wheel
incase of a flat. There is no documentation on Shimanos website
either. Can anyone tell me what to do and about how much time it
takes to do it? I've heard - and I don't know how true it is - that
it can take upwords of an HOUR to remove the rear wheel? Is this
true?

Sheldon Brown

Lobo Tommy wrote:

> I've got a Trek Navigator 400 with the next Nexus 8 hub and the
> documentation has NO instructions on how to change the rear wheel
> incase of a flat. There is no documentation on Shimanos website
> either. Can anyone tell me what to do and about how much time it
> takes to do it? I've heard - and I don't know how true it is - that
> it can take upwords of an HOUR to remove the rear wheel? Is this
> true?

I have a page on this. It's actually about the Nexus 7, but I doubt
that the 8 is very different.

http://sheldonbrown.com/nexus-tech

Sheldon "Still Waiting For The Nexus 8 Hubs I Ordered Months Ago" Brown
+------------------------------------------------------------+
| What are politicians going to tell people when the |
| Constitution is gone and we still have a drug problem? |
| -- William Simpson, A.C.L.U. |
+------------------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Lobo Tommy

Sheldon Brown <captbike@sheldonbrown.com> wrote in message news:<4089E01D.3010405@sheldonbrown.com>...
> I have a page on this. It's actually about the Nexus 7, but I doubt
> that the 8 is very different.
>
> http://sheldonbrown.com/nexus-tech
>
> Sheldon "Still Waiting For The Nexus 8 Hubs I Ordered Months Ago" Brown

Thanks!

I am picking up the bike today/tomorrow (I hope!) and will TRY to get
the LBS' mechanics to give me a hand on showing me how to remove the
rear wheel. I say this because any time I was interested in an
internal hub bicycle they tried to steer me away from it. I'm not a
psychic but they seemed to not want to either sell these and/or have
to service them. I don't know if that is because they never break or
they are a pain in the ass to work on.

Only time will tell!

By the way Sheldon, I don't know if you've seen this but it appears
Shimano has come out with a "premium" 8-Speed Internal Hub. It's not
on my '04 Trek Navigator 400, but just perusing Breezers website they
talk about a just released (they claim to be the only one using it in
North America) that is lighter in weight and more durable than the
'basic' 8 speed nexus.

Someday... Someday I will be able to afford a Rohloff with quick
release drop outs and be free of all this craziness )

Russell Seaton

empbt6@yahoo.com (Lobo Tommy) wrote in message news:<91177ef.0404231832.68fb4e37@posting.google.com>...
> I've got a Trek Navigator 400 with the next Nexus 8 hub and the
> documentation has NO instructions on how to change the rear wheel
> incase of a flat. There is no documentation on Shimanos website
> either. Can anyone tell me what to do and about how much time it
> takes to do it? I've heard - and I don't know how true it is - that
> it can take upwords of an HOUR to remove the rear wheel? Is this
> true?

I have not read Mr. Brown's webpage yet so he may mention this tip
too. But for the types of wheels where it is difficult to impossible
to remove the rear tire, it may be better to patch the tube without
removing the wheel. An example would be a fixed gear bike with track
nuts on the rear axle but you do not have a 15mm wrench with you.

Leave the wheel on the bike. Use tire levers or thumbs to get the
tire and tube off the rim but still trapped by the bike frame. Find
the hole and use a patch to patch the tube. Wait until the patch has
dried properly and reassemble the tube into the tire on the rim. Pump
up the tire/tube and if the patch job was good, continue the ride.

This method will not work for the new age modern bicyclist who does
not carry a Rema patch kit in the saddle bag and does not know have
the knowledge to patch a tube.

MP

As usual, an instructive page. But I don't see the answer to the OP's
question on it, namely, how to remove the rear wheel. Am I missing
something?

MP

On Fri, 23 Apr 2004 23:33:49 -0400, Sheldon Brown
<captbike@sheldonbrown.com> wrote:

>Lobo Tommy wrote:
>
>> I've got a Trek Navigator 400 with the next Nexus 8 hub and the
>> documentation has NO instructions on how to change the rear wheel
>> incase of a flat. There is no documentation on Shimanos website
>> either. Can anyone tell me what to do and about how much time it
>> takes to do it? I've heard - and I don't know how true it is - that
>> it can take upwords of an HOUR to remove the rear wheel? Is this
>> true?
>
>I have a page on this. It's actually about the Nexus 7, but I doubt
>that the 8 is very different.
>
>http://sheldonbrown.com/nexus-tech
>
>Sheldon "Still Waiting For The Nexus 8 Hubs I Ordered Months Ago" Brown
>+------------------------------------------------------------+
>| What are politicians going to tell people when the |
>| Constitution is gone and we still have a drug problem? |
>| -- William Simpson, A.C.L.U. |
>+------------------------------------------------------------+
> Harris Cyclery, West Newton, Massachusetts
> Phone 617-244-9772 FAX 617-244-1041
> http://harriscyclery.com
> Hard-to-find parts shipped Worldwide
>http://captainbike.com http://sheldonbrown.com

Pistof

"Lobo Tommy" <empbt6@yahoo.com> wrote in message
news:91177ef.0404231832.68fb4e37@posting.google.com...
> I've got a Trek Navigator 400 with the next Nexus 8 hub and the
> documentation has NO instructions on how to change the rear wheel
> incase of a flat. There is no documentation on Shimanos website
> either. Can anyone tell me what to do and about how much time it
> takes to do it? I've heard - and I don't know how true it is - that
> it can take upwords of an HOUR to remove the rear wheel? Is this
> true?

You will figure it out. I just want to recommend that you use some sort of
self-healing tube. When you get a puncture, a slime comes out of the tube
and seals itself. You never even know that you got a puncture. It's a
fantastic invention!

Dave

maxo

On Thu, 29 Apr 2004 20:57:49 -0500, Pistof wrote:

>
> "Lobo Tommy" <empbt6@yahoo.com> wrote in message
> news:91177ef.0404231832.68fb4e37@posting.google.com...
>> I've got a Trek Navigator 400 with the next Nexus 8 hub and the
>> documentation has NO instructions on how to change the rear wheel
>> incase of a flat. There is no documentation on Shimanos website
>> either. Can anyone tell me what to do and about how much time it
>> takes to do it? I've heard - and I don't know how true it is - that
>> it can take upwords of an HOUR to remove the rear wheel? Is this
>> true?

It doesn't take an hour, it takes about 15 minutes once you've figured out.

Congrats on the Nexus btw, I rode mine about 40k before it was stolen and
it just kept on ticking. About 10k of that was ridden in brutal Chicago
winter weather. I believe it's the best thing out there for the casual
rider or even the hardcore commuter that wants ultimate reliability. Mine
was just stolen a couple weeks ago

Here's the easiest way:
if you know where the puncture is, don't remove the wheel! just open up
the tire a little and ease out the portion of the tube you need to patch.

The hard way:
1 shift so that you have the least cable tension(1st gear I
think)--basically none.

2 then have a look at where the cable attaches to
the side of the hub. Wiggle it, see that you can spring it in one
direction to release the cable tension--this is pretty hard on your
fingers, gloves recommended. the nut on the end of the cable is flat on
two sides, rotate it with the tension released with the other hand and
disengage it from the slot. This is tricky, but you'll figure it out

3 If you have a roller brake, then take a driver and remove the stop arm
clamp.

4 remove wheel and fix as usual.

5 assembly is the reverse of disassembly

To adjust for cable stretch on a nexus:
1 shift into 4th gear (or the one in "red", this is for a 7 speed)

2 look at the mechanism on the hub and you'll see two little pieces of
steel with red markings on them on different bushings.

3 turn the cable adjuster barrel until they're aligned.

4 done!

Repacking the roller brake (if it starts to make noise)
1 remove rear wheel as above
2 unscrew lock bolt for brake assembly
3 flush with your choice of solvent and let dry completely
4 pack with grease, Shimano wants you to use their grease, which is
totally bogus. I have used Phil Woods green grease in mine with even
better "feel" as a result. With the extreme milage mentioned above, there
was probably 100k left in the brake when it was stolen.

Again, congrats on the Nexus, they're just bulletproof! I went through
only three chain with mine because of corrosion, but the original
sprockets, since they were thick steel didn't ever have to be replaced. If
you do replace the chain, remember that its a single speed chain--a BMX
chain works great if you can find it in the right length.

Zap me a post if any more questions or send a mail to Sheldon Brown at
Harris Cyclery--he's a Nexus nut.