Sram red quarq nhb and hb chainrings

Discuss light weight issues concerning road bikes & parts.

Moderator: robbosmans

Post Reply
User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

I did a search but didnt find what i was looking for.

Okay so im currently running a sram red 100bcd gxp crankset with hidden bolt (threads into crankarm) extralite chainrings. I just purchased a used sram red quarq gxp crankset and i noticed it was nhb (recessed threaded insert in the chainring) which i didnt realize there was the option. Anyhow,
1) can i rotate the quarq spline so the chainring bolt thats under the arm can be accessed outside the arm so i can use my hb extralite rings?
2)if not, which nhb lightweight chainrings can i purchase? I saw praxis buzz but none had the threaded insert on the chainrings that i could see.

Any ideas would be greatly appreciated.

Sent from my SM-G991U using Tapatalk

naked 3po, the first weight weenie.

TobinHatesYou
Posts: 9064
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

protocol_droid wrote:
Sun Nov 28, 2021 10:33 pm
I did a search but didnt find what i was looking for.

Okay so im currently running a sram red 100bcd gxp crankset with hidden bolt (threads into crankarm) extralite chainrings. I just purchased a used sram red quarq gxp crankset and i noticed it was nhb (recessed threaded insert in the chainring) which i didnt realize there was the option. Anyhow,
1) can i rotate the quarq spline so the chainring bolt thats under the arm can be accessed outside the arm so i can use my hb extralite rings?
2)if not, which nhb lightweight chainrings can i purchase? I saw praxis buzz but none had the threaded insert on the chainrings that i could see.

Any ideas would be greatly appreciated.

Sent from my SM-G991U using Tapatalk

Both the 8-bolt and 3-bolt DM interfaces are keyed so you can only orient the Quarq spider one way.

There should not be a threaded insert in chainrings used with NHB spiders or cranks. The threaded insert is only for chainrings used with modular HB spiders. You can use any 110bcd 5-bolt chainrings with NHB spiders. Even the SRAM chainrings should have anti-drop pins in the right position for both HB and NHB at this point.

by Weenie


Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓    Broad Selection ✓    Worldwide Delivery ✓

www.starbike.com



User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

Hey tobin. Thanks for chiming in. You can see there are serrated edges on the chainrings and the bolt. None of the other chainring holes have this. I had to whack this thing out. So i can just unscrew the 8 bolts on the arm and rotate the quarq assembly to access the bolt from both sides?Image

Sent from my SM-G991U using Tapatalk

naked 3po, the first weight weenie.

User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

Hi tobin. So you can see that this one has serrated edges to wedge in place in the chainrings. The others do not have this.

So i can unbolt the 8 bolts of the quarq module and rotate the arm so the one bolt aligned with the arm can be exposed for full chainbolt access?Image

Sent from my SM-G991U using Tapatalk

naked 3po, the first weight weenie.

TobinHatesYou
Posts: 9064
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

The serrated edges in the chainring are bite marks from the knurled nut. They weren't there before it was installed. NHB SRAM chainrings are just...chainrings. If you had a setup that required installation of the knurled nut, you'd have to install it on whichever chainrings you choose whether it's Praxis, Rotor, etc.

I have no idea why the knurled nut was installed on a NHB setup...it's not necessary. The only time the knurled nut is needed is when you are using modular HB cranksets, making it hard to inconvenient to use a regular chainring bolt.
Last edited by TobinHatesYou on Sun Nov 28, 2021 11:23 pm, edited 1 time in total.

User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

Duplicate post

Sent from my SM-G991U using Tapatalk


naked 3po, the first weight weenie.

User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

Thanks tobin. So theres not problem with unbolting the 8 bolts and rotating the quarq meter to expose that 5th chainring?

Sent from my SM-G991U using Tapatalk

naked 3po, the first weight weenie.

TobinHatesYou
Posts: 9064
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

protocol_droid wrote:
Sun Nov 28, 2021 11:28 pm
Thanks tobin. So theres not problem with unbolting the 8 bolts and rotating the quarq meter to expose that 5th chainring?

Sent from my SM-G991U using Tapatalk

NO, I said it isn't possible (without modification) in my first reply. The 8-bolt interface is keyed. One of the valleys is shallower than the rest. Unless you take a round/needle file to the interface on the Quarq, it won't fit.
Attachments
8bolt1.png

TobinHatesYou
Posts: 9064
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

All the chainring bolts are already exposed on a NHB spider so I can only assume that you're really confused and using the wrong terminology. You, in fact, have a HB Quarq and that's why the big chainring that came with it had a knurled nut installed.

User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

TobinHatesYou wrote:All the chainring bolts are already exposed on a NHB spider so I can only assume that you're really confused and using the wrong terminology. You, in fact, have a HB Quarq and that's why the big chainring that came with it had a knurled nut installed.
Ok my bad. I thought hidden bolt was the one bolt that screws into the crankarm while this version with the knurled nut is non hidden bolt.

So as you mentioned i would need to use this knurled nut for my extralite chainrings to make them work. Thanks.

Sent from my SM-G991U using Tapatalk


naked 3po, the first weight weenie.

TobinHatesYou
Posts: 9064
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

protocol_droid wrote:
Sun Nov 28, 2021 11:52 pm
TobinHatesYou wrote:All the chainring bolts are already exposed on a NHB spider so I can only assume that you're really confused and using the wrong terminology. You, in fact, have a HB Quarq and that's why the big chainring that came with it had a knurled nut installed.
Ok my bad. I thought hidden bolt was the one bolt that screws into the crankarm while this version with the knurled nut is non hidden bolt.

So as you mentioned i would need to use this knurled nut for my extralite chainrings to make them work. Thanks.

It looks like Extralite chainrings only have one position for the chain anti-drop pin. You might want to buy the version with the pin in the right position (in line with one of the chainring bolts.)

User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

TobinHatesYou wrote:
protocol_droid wrote:
Sun Nov 28, 2021 11:52 pm
TobinHatesYou wrote:All the chainring bolts are already exposed on a NHB spider so I can only assume that you're really confused and using the wrong terminology. You, in fact, have a HB Quarq and that's why the big chainring that came with it had a knurled nut installed.
Ok my bad. I thought hidden bolt was the one bolt that screws into the crankarm while this version with the knurled nut is non hidden bolt.

So as you mentioned i would need to use this knurled nut for my extralite chainrings to make them work. Thanks.

It looks like Extralite chainrings only have one position for the chain anti-drop pin. You might want to buy the version with the pin in the right position (in line with one of the chainring bolts.)
Its got 2 positions for the pinImage

Sent from my SM-G991U using Tapatalk

naked 3po, the first weight weenie.

TobinHatesYou
Posts: 9064
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Good to go then.

User avatar
protocol_droid
Posts: 297
Joined: Sat Aug 20, 2005 7:40 am
Location: San Diego, CA

by protocol_droid

TobinHatesYou wrote:Good to go then.
Thanks again. Got it all buttoned up now.

Sent from my SM-G991U using Tapatalk

naked 3po, the first weight weenie.

by Weenie


Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓    Broad Selection ✓    Worldwide Delivery ✓

www.starbike.com



Post Reply