Time to replace my Drive train, need some sugestions......

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KarlC
Posts: 1028
Joined: Fri Dec 05, 2014 2:08 am
Location: De Portola Wine Trail Temecula CA

by KarlC

Hello my BMC TMR01 with Ultegra 6700 Di2 drive train is wearing out so will need to be replaced soon.

Now I have

Crank - Ultegra 6700-G - 50/34 with a press fit BB86 bottom bracket- My Large chain right needs replaced soon.

Chain - Ultegra - Needs replaced soon.

Cassette - Dura Ace 11-28 - Needs replaced soon.

I would like to lose some grams with out braking the bank, any suggestions ?

Also would like 52/34 chain rings, THX for your input.


My bike is here ..... viewtopic.php?f=10&t=131523&p=1126573#p1126573

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C64 My Sixty 4 SR EPS 12

Valbrona
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by Valbrona

But we know you are going to buy Shimano whatever people say.

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mrgray
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by mrgray

beautiful bike - love the stem and bar setup.

52 and 34 is OK? i did not know that.

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KarlC
Posts: 1028
Joined: Fri Dec 05, 2014 2:08 am
Location: De Portola Wine Trail Temecula CA

by KarlC

Valbrona wrote:But we know you are going to buy Shimano whatever people say.


LOL Actualy I was thinking .....

Crank - Sram Red GXP Exogram + aftermarket rings based on this thread .. viewtopic.php?f=3&t=133320 .... But I dont know if all Red GXP are the same or what one will fit my bike ???

Chain - I really don't know

Cassette - Sram Red or Dura Ace ??

But I consider myself a rookie at this sort of thing so was hoping for same wise input on durable light weight good value products.

Thx
C64 My Sixty 4 SR EPS 12

muntos
Posts: 247
Joined: Wed May 29, 2013 5:41 pm
Location: Romania

by muntos

I opted for a Rotor 3D24 crankset with Rotor Qrings , I think will fit perfectly on your bike.
viewtopic.php?f=10&t=136895&start=15#p1215736

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toiyuet
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Location: Hong Kong

by toiyuet

If I were you, I' ll stick to bombprof Shimano chainset, 52 / 34 combo is fine with Di2.

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wheelsONfire
Posts: 6280
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

KarlC wrote:Hello my BMC TMR01 with Ultegra 6700 Di2 drive train is wearing out so will need to be replaced soon.

Now I have

Crank - Ultegra 6700-G - 50/34 with a press fit BB86 bottom bracket- My Large chain right needs replaced soon.

Chain - Ultegra - Needs replaced soon.

Cassette - Dura Ace 11-28 - Needs replaced soon.

I would like to lose some grams with out braking the bank, any suggestions ?

Also would like 52/34 chain rings, THX for your input.


My bike is here ..... viewtopic.php?f=10&t=131523&p=1126573#p1126573

Image



You should go ahead and try OMC Italia crankset.

I must be a killer on your bike. They say that thing shift fast and also very stiff.
I would order a 52/36 version if i ordered for a road bike.

If you want a stiff cassette, Edco Monoblock.
Cost a fair bit, but i think it will be durable longer.
I have 3 Edco cassettes. 12-28*1 and 14-25*2.
I like 14-25 best since i hardly never used the missing gears (11,12 and 13).
Also, it is a very very linear ratio when shifting.
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mimason
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Joined: Tue Feb 24, 2009 11:43 pm
Location: Florida

by mimason

Lose a little weight and keep with Shimano mostly with good upgrade path....

Perhaps wait for the 9100 crank then DA chain with SRAM RED cassette. To buy time just replace the cassette(Red) and chain(ultegra) and ride that shark toothed front ring out a bit longer; just favor the small ring if you can avoid cross chaining.

earlfoss
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by earlfoss

The OMC Italia cranks look great :)


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beanbiken
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Location: Great Southern Land

by beanbiken

KarlC wrote:Also would like 52/34 chain rings, THX for your input.


Just some info with chain ring choice. I have Di2 9070 and was running 52/36. shifted like a charm. Thought I would be smart and tried 52/34 for a couple of steep ascents planned. Shifted like s##t........... Yes i had all the planets, triangles aligned, double/triple checked. Changed to 50/34 beautiful again. So if you stay with Shimano use their recommended combinations.
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mai
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Location: Hong Kong

by mai

seems to me the best thing to do at the moment is to wait a couple more months to see what the new DA looks like :)

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mpulsiv
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Joined: Mon Mar 24, 2014 9:17 pm

by mpulsiv

Shimano chainrings are forged, 20k miles is just break-in period for them. Are you just looking for an excuse to get something lighter? Shimano will make splash of new products this summer.


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AJS914
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Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

How many miles on this drive train?

KarlC
Posts: 1028
Joined: Fri Dec 05, 2014 2:08 am
Location: De Portola Wine Trail Temecula CA

by KarlC

muntos wrote:I opted for a Rotor 3D24 crankset with Rotor Qrings , I think will fit perfectly on your bike.
viewtopic.php?f=10&t=136895&start=15#p1215736


I like the look of the Rotor, but I just don't know anything about them or what one would fit my frame with BB86

toiyuet wrote:If I were you, I' ll stick to bombprof Shimano chainset, 52 / 34 combo is fine with Di2.


This does seam like the EZest thing to do, especially since I feel lost with what will fit my frame

wheelsONfire wrote: You should go ahead and try OMC Italia crankset.

I must be a killer on your bike. They say that thing shift fast and also very stiff.
I would order a 52/36 version if i ordered for a road bike.

If you want a stiff cassette, Edco Monoblock.
Cost a fair bit, but i think it will be durable longer.
I have 3 Edco cassettes. 12-28*1 and 14-25*2.
I like 14-25 best since i hardly never used the missing gears (11,12 and 13).
Also, it is a very very linear ratio when shifting.


I like the OMC Italia crankset but have read they have some issues that are not worked out yet.


mimason wrote:Lose a little weight and keep with Shimano mostly with good upgrade path....

Perhaps wait for the 9100 crank then DA chain with SRAM RED cassette. To buy time just replace the cassette(Red) and chain(ultegra) and ride that shark toothed front ring out a bit longer; just favor the small ring if you can avoid cross chaining.


Sound advice

mpulsiv wrote:Shimano chainrings are forged, 20k miles is just break-in period for them. Are you just looking for an excuse to get something lighter? Shimano will make splash of new products this summer.

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It cant have anywhere near 20k miles, I was told by my honest LBS that I will need a chain and Large chain ring soon. I use the large chain ring about 80% of the time.

AJS914 wrote:How many miles on this drive train?


Not sure I got this bike as a Dealer demo and have added about 3K miles myself.
C64 My Sixty 4 SR EPS 12

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mimason
Posts: 654
Joined: Tue Feb 24, 2009 11:43 pm
Location: Florida

by mimason

KarlC , post a pics of your Chainrings. They're normally toast when they develop a shark-toothed profile.

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