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-   -   Nexus 8 IGH + Roller Brake (https://www.bikeforums.net/utility-cycling/447042-nexus-8-igh-roller-brake.html)

vik 07-28-08 05:38 PM

Nexus 8 IGH + Roller Brake
 
I've got a little project in mind and want to use a Nexus 8 with a roller brake. Are there any frame/dropout issues I need to take into account? I'm thinking of putting this on a Surly 1x1 frame.

If I order the following bits am I good?

- Shimano Nexus 8 speed hub [premium red band version] - SG-8R25
- Shimano Hub Roller Brake - BR-IM70-R
- Shimano Nexus Shifter - SL-8S20

Does the roller brake need a v-brake compatible lever or will it work with a standard road bike brake lever?

Thanks...:D

legot73 07-28-08 08:12 PM

Make sure the hub comes with the trim kit. Your dropout concerns are taken care of by various pair of anti-rotation washers (yellow for track, grey for vertical, brown for ?). This should be standard with the hub, but it depends on how you get one. I'm pretty sure the hub can be spaced from 120 to 135mm, so you should be good there. Good question about the road lever. I've only used the roller brake with the v-brake lever. A travel agent, cleverly rigged, might be the answer.

invisiblehand 07-28-08 09:45 PM


Originally Posted by legot73 (Post 7155368)
I'm pretty sure the hub can be spaced from 120 to 135mm, so you should be good there.

Really ... you can get it that narrow? I recall reading that someone got it to fit a Brompton's drop outs but it required a lot of surgery. I also thought that some people got it to fit a Raleigh 20 but they had to spread the rear dropouts to do so.

vik 07-28-08 10:08 PM


Originally Posted by legot73 (Post 7155368)
Make sure the hub comes with the trim kit. Your dropout concerns are taken care of by various pair of anti-rotation washers (yellow for track, grey for vertical, brown for ?). This should be standard with the hub, but it depends on how you get one. I'm pretty sure the hub can be spaced from 120 to 135mm, so you should be good there. Good question about the road lever. I've only used the roller brake with the v-brake lever. A travel agent, cleverly rigged, might be the answer.

Cool...thanks for the info. This will be my first Nexus build. I've got some Dia Compe 287V levers that will work. I haven't used a roller brake before, but I'm assuming it will be a better all weather option than v-brakes.

unkchunk 07-28-08 10:36 PM

I originally had the roller brake with my Nexus 8. It came with V-brake levers. I think it stopped the bike okay. I had it removed because I could never figure out how to take off the rear wheel if I ever got a flat. Then I cleaned it, sprayed it with Boeshield and put it in a zip lock bag.

Anyways, if you want a roller brake cheap let me know. Since you're the Vic I'll trust ya. I've been lurking your site because I'm thinking of switching my NWT for a Tikit.

legot73 07-29-08 08:16 AM

I was almost right, it spaces down as low as 126mm, not 120. It definitely fits 130 or 135, though.

I was attracted to the roller brake for icy winter conditions as "plan B". My front v-brake always did the job, however, even if I had to "pump" it to clear the rim sometimes. The roller brake doesn't have a lot of stopping power in the rear, but it works equally well wet or dry, for what that's worth. I wouldn't recommend it as your only brake. I'd like to experience one on the front wheel sometime, I imagine it would work pretty well.

Changing out a rear flat can be a significant operation. Besides wrenches for the axle nuts, you'll have to disconnect the shifter and brake cable. The shifter is pretty easy, but a 2mm allen wrench on hand makes it easier to replace. The brake cable has a nut/bolt/p-clip mount to the chain stay. Not only is it a pain to remove, but you need to get it secured nice and tight for the brake to work well. Someone on BF had suggested replacing the nut with a wing-nut, which I think is a great idea. All this becomes much more difficult when your fingers are numb, so a lot of practice changing out the rear wheel comes highly recommended. I just put in a Mr. Tuffy tire liner as insurance, and never had an issue again.

In temps below 20F (7C), the downshifting got sticky. It wasn't the cable in my case, but the lever on the hub itself. It would go to higher gears just fine, but wouldn't release to lower gears, at least not for a few minutes. The cable would slack up in front of the hub. I ended up just riding in 5th most of the time, since that's a direct drive gear and feels more efficient than the others. I'll be interested in your cold weather experience with one.

All that said, between the hub, a full chain case, and good fenders, I only lubed and wiped down every other week, and did a deep cleaning in the spring (salt). And that was the whole point.

vik 07-29-08 09:01 AM


Originally Posted by legot73 (Post 7158184)
I was almost right, it spaces down as low as 126mm, not 120. It definitely fits 130 or 135, though.

I was attracted to the roller brake for icy winter conditions as "plan B". My front v-brake always did the job, however, even if I had to "pump" it to clear the rim sometimes. The roller brake doesn't have a lot of stopping power in the rear, but it works equally well wet or dry, for what that's worth. I wouldn't recommend it as your only brake. I'd like to experience one on the front wheel sometime, I imagine it would work pretty well.

Changing out a rear flat can be a significant operation. Besides wrenches for the axle nuts, you'll have to disconnect the shifter and brake cable. The shifter is pretty easy, but a 2mm allen wrench on hand makes it easier to replace. The brake cable has a nut/bolt/p-clip mount to the chain stay. Not only is it a pain to remove, but you need to get it secured nice and tight for the brake to work well. Someone on BF had suggested replacing the nut with a wing-nut, which I think is a great idea. All this becomes much more difficult when your fingers are numb, so a lot of practice changing out the rear wheel comes highly recommended. I just put in a Mr. Tuffy tire liner as insurance, and never had an issue again.

In temps below 20F (7C), the downshifting got sticky. It wasn't the cable in my case, but the lever on the hub itself. It would go to higher gears just fine, but wouldn't release to lower gears, at least not for a few minutes. The cable would slack up in front of the hub. I ended up just riding in 5th most of the time, since that's a direct drive gear and feels more efficient than the others. I'll be interested in your cold weather experience with one.

All that said, between the hub, a full chain case, and good fenders, I only lubed and wiped down every other week, and did a deep cleaning in the spring (salt). And that was the whole point.

I'll be running a disc up front...too bad I can't run the Nexus with a rear disc that would be a simple solution.

This would be a winter bike project so cold weather shifting is important so that might be a deal breaker. Besides a Rohloff are there any IGHs that take a disc rotor and deal with winter temps well?

I typically run Marathon XRs or something similar on my working bikes so I don't really get flats.

Thanks for all the info!....:thumb:

invisiblehand 07-29-08 09:14 AM


Originally Posted by vik (Post 7158510)
I'll be running a disc up front...too bad I can't run the Nexus with a rear disc that would be a simple solution.

Perhaps you should get the Alfine instead.

cman 07-29-08 09:15 AM

Double check on the anti rotation washers. I just installed a older 7 on some track ends. Left is white, Right is chrome/silver. http://www.sheldonbrown.com/harris/s...xus.html#parts

They do make the Alfine in a disc.
http://www.sheldonbrown.com/harris/shimano-alfine.html

Allen 07-29-08 09:27 AM


Originally Posted by vik (Post 7158510)
Besides a Rohloff are there any IGHs that take a disc rotor and deal with winter temps well?

The NuVinci will take a disk. I'm in the South, so as far as cold temps go--uh--mine worked fine at -2șC.

vik 07-29-08 10:01 AM


Originally Posted by invisiblehand (Post 7158601)
Perhaps you should get the Alfine instead.

+1 - thanks I found was poking around Shimano's site and just saw the Alfine takes a disc.


Originally Posted by AllenG (Post 7158735)
The NuVinci will take a disk. I'm in the South, so as far as cold temps go--uh--mine worked fine at -2șC.

Good suggestion Allen. This is one application I'd see a good fit for the Nuvinci.

I'll do a bit more poking around before I make a decision.

legot73 07-29-08 10:33 AM

If the few hundred US$ more aren't an issue, I think the Nuvinci looks more promising. Sticky shifting resulted in some gear slips and other goofs for me. The continuously variable nature of the Nuvinci means there are no "gears" to miss, and the dual cable system means you are always pushing AND pulling the cable to adjust gearing, which allows you to muscle through any stickiness. Other than my schmatic reviews, though, I have no practical experience with the Nuvinci, just love the concept.


Originally Posted by vik (Post 7159044)
+1 - thanks I found was poking around Shimano's site and just saw the Alfine takes a disc.



Good suggestion Allen. This is one application I'd see a good fit for the Nuvinci.

I'll do a bit more poking around before I make a decision.


vik 07-29-08 05:57 PM

http://cycle.shimano-eu.com/media/im...9830628467.jpg

I'm going to go with the Alfine hub and a disc brake [got a great deal if I buy Shimano], but I need to make sure I order the right part.

Looking on this Shimano site there are two different model numbers listed for the Alfine. I'd like the black hub and the disc brake option. Any idea what the differences between these models SG-S500 & SG-S500-L are?

I just noticed that the Alfine doesn't have a grip shift type shifter. I'm planning on using a drop bar on this bike so a trigger shifter won't work. Would the Nexus 8 grip shifter work with the Alfine?

unkchunk 07-29-08 07:01 PM


Would the Nexus 8 grip shifter work with the Alfine?
Nope. All the IHG shifters are for MTB handlebars. For drops you'll have to get some sort of adapter like the HubBub, which is pretty expensive. Another possibility is to use one of those handle bar space extenders or a modified bar end.

vik 07-29-08 07:20 PM


Originally Posted by unkchunk (Post 7163390)
Nope. All the IHG shifters are for MTB handlebars. For drops you'll have to get some sort of adapter like the HubBub, which is pretty expensive. Another possibility is to use one of those handle bar space extenders or a modified bar end.

I have no problem using a Hubbub adapter - in fact I was planing on it, but the Alfine only seems to come with trigger shifters which I can't use on drop bars. My question is the Nexus 8 grip shifter compatible with the Alfine? If so I'll just use that with the Hubbub adapter.

Dan Burkhart 07-30-08 07:26 AM


Originally Posted by vik (Post 7162894)
http://cycle.shimano-eu.com/media/im...9830628467.jpg

I'm going to go with the Alfine hub and a disc brake [got a great deal if I buy Shimano], but I need to make sure I order the right part.

Looking on this Shimano site there are two different model numbers listed for the Alfine. I'd like the black hub and the disc brake option. Any idea what the differences between these models SG-S500 & SG-S500-L are?

I just noticed that the Alfine doesn't have a grip shift type shifter. I'm planning on using a drop bar on this bike so a trigger shifter won't work. Would the Nexus 8 grip shifter work with the Alfine?

The L in the model # indicates a black hub, no L is silver. All Alfine hubs accept a centre lock disc rotor. The spoke hole count does not show up in the model #, so be sure you are getting the desired drilling from your supplier.
The Alfine will work fine with a Nexus twist shifter.
Be aware that the fitting kit and sprocket are sold searately from the hub. Be sure to order them along with the hub.

Dan Burkhart 07-30-08 07:29 AM


Originally Posted by vik (Post 7163553)
I have no problem using a Hubbub adapter - in fact I was planing on it, but the Alfine only seems to come with trigger shifters which I can't use on drop bars. My question is the Nexus 8 grip shifter compatible with the Alfine? If so I'll just use that with the Hubbub adapter.

The shifter is not included with the hub either, so just order the Nexus twist shifter instead of the Alfine shifter. It's half the price too.

vik 07-30-08 08:21 AM


Originally Posted by Dan Burkhart (Post 7166332)
The shifter is not included with the hub either, so just order the Nexus twist shifter instead of the Alfine shifter. It's half the price too.

That was what I am considering - so I take it the Nexus shifter will be compatible with the Alfine hub?

unkchunk 07-30-08 08:58 AM


Originally Posted by vik (Post 7166703)
That was what I am considering - so I take it the Nexus shifter will be compatible with the Alfine hub?

I'm assuming so. I have see many references that the Alfine RapidFire shifter will work with the Nexus hub. I assume that the reverse is possible, that a Nexus shifter will work with a Alfine hub, but don't recall seeing a specific reference on that.

vik 07-30-08 09:13 AM


Originally Posted by unkchunk (Post 7166997)
I'm assuming so. I have see many references that the Alfine RapidFire shifter will work with the Nexus hub. I assume that the reverse is possible, that a Nexus shifter will work with a Alfine hub, but don't recall seeing a specific reference on that.

Well I took the plunge and put in the order. I'll report back on how it all works.

unkchunk 07-30-08 07:18 PM


Originally Posted by vik (Post 7167134)
Well I took the plunge and put in the order. I'll report back on how it all works.

"I took the plunge", that's the way I felt when I got my Nexus way back. No LBS in my area had ever done one and I choose the one shop that was interested in trying. It turn out great.

flatboarder 07-31-08 04:02 AM

Nexus Shifter is intended for use with Alfine as well. No concerns about. Alfine Disk is working well for me, I have got 3 of them. Hub spacing: JFTR: I installed a Nexus Inter-8 red line with BR-IM70 roller brake into 120mm spaced horizontal dropouts :)
--> Check my homepage for details (German language, but lots of pictures!)
It is not quite easy. Hub and brake needs to be modified. But it is possible, somehow. This will only work with Nexus 8 speed hub, but not with Alfine (no rollerbrake for Alfine, no removable hexnuts to reduce axle spacing)

Braking performance of roller brake is quite low. I would not bet on being better than V-brakes under whatever conditions. Also, it needs some grease every now and then.

But thumbs up for Alfine, as I said. I am using it on 2 MTBs and my Big Dummy, no problems so far.

vik 07-31-08 07:24 AM


Originally Posted by flatboarder (Post 7173506)
Nexus Shifter is intended for use with Alfine as well. No concerns about. Alfine Disk is working well for me, I have got 3 of them. Hub spacing: JFTR: I installed a Nexus Inter-8 red line with BR-IM70 roller brake into 120mm spaced horizontal dropouts :)
--> Check my homepage for details (German language, but lots of pictures!)
It is not quite easy. Hub and brake needs to be modified. But it is possible, somehow. This will only work with Nexus 8 speed hub, but not with Alfine (no rollerbrake for Alfine, no removable hexnuts to reduce axle spacing)

Braking performance of roller brake is quite low. I would not bet on being better than V-brakes under whatever conditions. Also, it needs some grease every now and then.

But thumbs up for Alfine, as I said. I am using it on 2 MTBs and my Big Dummy, no problems so far.

Thanks for the response. ..:thumb:

vik 07-31-08 07:26 AM


Originally Posted by unkchunk (Post 7171648)
"I took the plunge", that's the way I felt when I got my Nexus way back. No LBS in my area had ever done one and I choose the one shop that was interested in trying. It turn out great.

My local LBS[s] are not real savvy on anything out of the road bike/MTB box...lol...so I'll be like you and boldly go where few are going around here!...;)


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