Can you get a 49 outer ring for Ultegra 6750 chain set?

Toggle sidebar Toggle sidebar
ruamruam

ruamruam

Jun 3, 2009
618
111
10,180
Hi,

My son races on restricted gears and he bought a new bike with an Ultegra 6750 compact (50/34) chain set. He races underage and the max gear he is allowed is 49/16. When buying the bike I just saw Ultegra and presumed I could change the outer ring for a 49 one but Ultegra 6750 is different and the normal rings don't fit.

Does anyone know if you can replace the 50 ring with a 49 one?

Thanks
 
ruamruam

ruamruam

Jun 3, 2009
618
111
10,180
King Boonen said:
I think the PCD is correct but an email to wiggle to check would be in order as it is listed as a track ring:

http://www.wiggle.co.uk/ta-130-pcd-shimano-track-outer-chainring-44-49t/

Edit:

think this is a better option:

http://www.wiggle.co.uk/ta-130-pcd-alize-outer-chainrings-47-49t/
Click to expand...

Thanks for that but will those fit on a Ultegra 6750. It is different to the 6600 I have on my bike. Is it just a case of buying the second one you mentioned and buying bolts?

Below is the Ultegra outer chainring for the 6750. I have e mailed wiggle and am awaiting a reply

http://www.sjscycles.co.uk/images/products/medium/27603.jpg
 
ruamruam

ruamruam

Jun 3, 2009
618
111
10,180
King Boonen said:
Honestly not sure, it looks like it might but have never tried it. If it won't they may be able to suggest something else.

Can you take the chainset off his old bike and use that?
Click to expand...

No, he just started racing this year and the old chainset is rubbish. Thanks anyway I will await the answer from Wiggle
 
Bustedknuckle

Bustedknuckle

Jul 23, 2009
5,412
19
17,510
ruamruam said:
Hi,

My son races on restricted gears and he bought a new bike with an Ultegra 6750 compact (50/34) chain set. He races underage and the max gear he is allowed is 49/16. When buying the bike I just saw Ultegra and presumed I could change the outer ring for a 49 one but Ultegra 6750 is different and the normal rings don't fit.

Does anyone know if you can replace the 50 ring with a 49 one?

Thanks
Click to expand...

Even tho it won't have all the hollow arms and such of the original ring, it's just a 110mm BCD. May look goofy but any 110BCD 49t ring will work fine. You will need more conventional chainring bolts/nuts since the 6700 CR bolts screw in from the back of the ring.
 
ruamruam

ruamruam

Jun 3, 2009
618
111
10,180
Bustedknuckle said:
Even tho it won't have all the hollow arms and such of the original ring, it's just a 110mm BCD. May look goofy but any 110BCD 49t ring will work fine. You will need more conventional chainring bolts/nuts since the 6700 CR bolts screw in from the back of the ring.
Click to expand...

Thanks for that. That is what I was hoping. Appreciate your help

Ruamruam
 
ruamruam

ruamruam

Jun 3, 2009
618
111
10,180
JayKosta said:
Do the rules allow adjusting the rear deraileur so it won't shift into the highest gear? That would be least expensive option.

Jay Kosta
Endwell NY USA
Click to expand...

They do but he would be at a series disadvantage using a 50/17 (6.2 metres) instead of a 49/16 (6.4 metres) Make a huge difference in a sprint.
 
King Boonen

King Boonen

Jul 25, 2012
12,967
1,966
25,680
Bustedknuckle said:
Even tho it won't have all the hollow arms and such of the original ring, it's just a 110mm BCD. May look goofy but any 110BCD 49t ring will work fine. You will need more conventional chainring bolts/nuts since the 6700 CR bolts screw in from the back of the ring.
Click to expand...

I thought shimano road groups were 130?
 
ruamruam

ruamruam

Jun 3, 2009
618
111
10,180
Chainreaction cycles and Wiggles have confirmed that I need a 110 bcd 49 t chainring but neither have one. I have looked on line but cannot find any. I can find 48 and 50 but not 49

Does anyone know where I can get one?

Thanks
 
Bustedknuckle

Bustedknuckle

Jul 23, 2009
5,412
19
17,510
ruamruam said:
Chainreaction cycles and Wiggles have confirmed that I need a 110 bcd 49 t chainring but neither have one. I have looked on line but cannot find any. I can find 48 and 50 but not 49

Does anyone know where I can get one?

Thanks
Click to expand...

Just use the 48t..you'll be legal and it won't mean much at all.
 
King Boonen

King Boonen

Jul 25, 2012
12,967
1,966
25,680
ruamruam said:
Chainreaction cycles and Wiggles have confirmed that I need a 110 bcd 49 t chainring but neither have one. I have looked on line but cannot find any. I can find 48 and 50 but not 49

Does anyone know where I can get one?

Thanks
Click to expand...

Couple of options, again double check to be 100% sure it'll fit.

http://www.spacycles.co.uk/products.php?plid=m2b34s113p1725

http://www.ukbikestore.co.uk/product/54/crsu10/surly-stainless-steel-chainring-110bcd-5-arm.html

Couldn't see anything listed but based on their stock these guys may be able to help if you give them a ring.

http://www.velosolo.co.uk/shopcrank.html
 
ruamruam

ruamruam

Jun 3, 2009
618
111
10,180
King Boonen said:
Couple of options, again double check to be 100% sure it'll fit.

http://www.spacycles.co.uk/products.php?plid=m2b34s113p1725

http://www.ukbikestore.co.uk/product/54/crsu10/surly-stainless-steel-chainring-110bcd-5-arm.html

Couldn't see anything listed but based on their stock these guys may be able to help if you give them a ring.

http://www.velosolo.co.uk/shopcrank.html
Click to expand...

The first two options are for 6 - 9 speeds not 10 so wont fit but thanks anyway.

E mailed the third option, and am awaiting a reply.

Thanks

ruam
 
H

Headwind_

May 23, 2013
1
0
0
Specialites TA makes the largest selection of chain rings that I know of, including a 49t 110BCD outer. I use TA rings on 5650 and 6500 series cranks, but have no direct experience with 6750.

They're a bit hard to find; I've purchased from http://www.dotbike.com/p/2143
 
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom