Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Sat Jan 20, 2018 2:35 pm

All times are UTC+01:00





Post new topic  Reply to topic  [ 21 posts ]  Go to page 1 2 Next
Author Message
PostPosted: Tue Jul 11, 2017 5:20 am 
Offline

Joined: Mon Aug 29, 2016 11:19 am
Posts: 426
Hello weenies...

A friend is getting ready for the Taiwan KOM climb and is worried of burning out and having to walk the bike the 27% grades at the end as well as not finishing within the 7h time limit. He likes to spin and just dislikes being out of the saddle.

He's on a wilier running campy veloce 10s with a compact crank 50/34 and a 12-30t cassette. The derailleur is already the longest available thats compatible (medium) and looks to be at the limit on the 30t cog. Not much space to fit even a 32t which isn't available from campy (campy freehub).

To the point. I saw on youtube you can fit an mtb crank on there. The problem is the chainring size. Double chainring cranks are usually maxed at 42/28t and we would like a 46/28 or 46/30. Do you have an idea which common crank can be fitted with such rings and could work on a 10s road bike?

He has a clamp on front derailleur that can be lowered appropriately. I've been looking to get an mtb crank in an appropriate bcd and switch a chainring if needed. What do you think?

Thank you for reading!
/a


Top
   
PostPosted: Tue Jul 11, 2017 5:58 am 
Offline

Joined: Thu Jun 28, 2012 10:52 pm
Posts: 342
Location: eNZed
46/33 on compact 110bcd is definitely doable.
mtb cranks have higher Q-factor, no?

_________________
Less is more.


Top
   
Posted: Tue Jul 11, 2017 5:58 am 


Top
   
 
PostPosted: Tue Jul 11, 2017 6:28 am 
Offline
User avatar

Joined: Mon Sep 07, 2015 1:02 am
Posts: 282
Location: Brisbane
Look at those new fsa and praxis sub-compacts.
46/30 and 48/32

_________________
Chapter 2 Tere
Scott Spark 720plus


Top
   
PostPosted: Tue Jul 11, 2017 7:39 am 
Offline

Joined: Wed Jan 22, 2014 11:48 am
Posts: 2515
Location: Vienna Austria
If you really want to fit an MTB crank (higher Q factor but most ppl don't notice) you can get *all* ring sizes from Specialites TA.


Top
   
PostPosted: Tue Jul 11, 2017 8:23 am 
Offline

Joined: Tue Sep 08, 2015 7:30 pm
Posts: 6
I replaced a Shimano compact with a 46/30 FSA Omega (2017) on my wife's road bike. Only gotcha is that you have to replace the bottom bracket since the FSA has a 19mm spindle, which also implies that there are not a lot of bottom bracket options (only the ones from FSA themselves). They also have a pricier version (SL-K adventure).

Overall we're very happy with it. Much better solution than having to fit a cassette with large gaps between gears.


Top
   
PostPosted: Tue Jul 11, 2017 8:56 am 
Offline

Joined: Mon Aug 29, 2016 11:19 am
Posts: 426
What do you think would happen if you get for example a 3 ring crank like 48/36/24t and take out the 36, put the 48 on it's place and swap out the little one for a 30t (64bcd).

An outer ring being used as a middle ring. How would that work?

/a


Top
   
PostPosted: Tue Jul 11, 2017 9:50 am 
Offline
User avatar

Joined: Mon Sep 07, 2015 1:02 am
Posts: 282
Location: Brisbane
I think your chainring spacing will be way out.

_________________
Chapter 2 Tere
Scott Spark 720plus


Top
   
PostPosted: Tue Jul 11, 2017 10:15 am 
Offline

Joined: Fri May 25, 2007 6:43 pm
Posts: 3337
All the spotfaces on the chainring will be wrong, ring spacing *should* be ok. But chainline might be odd.


Top
   
PostPosted: Tue Jul 11, 2017 11:24 am 
Offline

Joined: Wed Mar 15, 2017 5:30 pm
Posts: 364
Rotor announced a 46/30 chainring set that mounts to their cranks but I have only seen one set in the wild.


Top
   
PostPosted: Tue Jul 11, 2017 12:13 pm 
Offline

Joined: Wed Jan 22, 2014 11:48 am
Posts: 2515
Location: Vienna Austria
alcatraz wrote:
What do you think would happen if you get for example a 3 ring crank like 48/36/24t and take out the 36, put the 48 on it's place and swap out the little one for a 30t (64bcd).

An outer ring being used as a middle ring. How would that work?

/a


I did this on my old CX, riding 26/40 and 30/40 with a FSA Gossamer triple and TA rings. Shifting was *excellent*.

Because of the positive experience, I just did the same for my wife's new (all-)road bike, she now has an FSA SL-K carbon triple crank with the 26/40 combo and an 11-32 in the back.

Image


Top
   
PostPosted: Tue Jul 11, 2017 12:36 pm 
Offline
User avatar

Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1901
Location: Welland, Ontario
I had a Campy 10-speed cross bike that was used on trails. Ended up with a Deore crankset and needed a Deore FD as well. The stock FD will foul the chainstay before being low enough. Everything worked fine.

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


Top
   
PostPosted: Tue Jul 11, 2017 2:18 pm 
Offline

Joined: Sat May 21, 2016 12:59 pm
Posts: 410
Marin wrote:
alcatraz wrote:
What do you think would happen if you get for example a 3 ring crank like 48/36/24t and take out the 36, put the 48 on it's place and swap out the little one for a 30t (64bcd).

An outer ring being used as a middle ring. How would that work?

/a


I did this on my old CX, riding 26/40 and 30/40 with a FSA Gossamer triple and TA rings. Shifting was *excellent*.

Because of the positive experience, I just did the same for my wife's new (all-)road bike, she now has an FSA SL-K carbon triple crank with the 26/40 combo and an 11-32 in the back.



What was source for 40T chainring?
Was it chainring for big or middle position originally?

_________________
'


Last edited by ooo on Tue Jul 11, 2017 2:33 pm, edited 2 times in total.

Top
   
PostPosted: Tue Jul 11, 2017 2:31 pm 
Offline

Joined: Wed Jan 22, 2014 11:48 am
Posts: 2515
Location: Vienna Austria
ooo wrote:
What was source for 40T chainring?
Was it chainring for big or middle position originally?


Specialites TA. Middle ring.


Top
   
PostPosted: Tue Jul 11, 2017 2:42 pm 
Offline

Joined: Thu Apr 14, 2016 11:01 am
Posts: 53
Location: France
On Rotor crankset, it's possible to change the spider for the MTB one, 110/74 (or 60, Rotor proprietary). You keep the road Q factor, have the possibility to have less than 30t on the inner.


Top
   
PostPosted: Tue Jul 11, 2017 4:42 pm 
Offline

Joined: Wed Mar 15, 2017 5:30 pm
Posts: 364
jeanjacques wrote:
On Rotor crankset, it's possible to change the spider for the MTB one, 110/74 (or 60, Rotor proprietary). You keep the road Q factor, have the possibility to have less than 30t on the inner.

Didn't realize they were interchangeable, good to know as I primarily run Rotor cranks due to them offering shorter lengths. On a similar vein TA Specialites cranks allow you to do the same, although they are square taper.


Top
   
Posted: Tue Jul 11, 2017 4:42 pm 


Top
   
 
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 21 posts ]  Go to page 1 2 Next

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Attachment(s) Dura Ace 9100 Crank on Boardman 6.84kg bike

in Road

Kevinch76

1

955

Fri Jul 28, 2017 4:39 am

CycloTron View the latest post

There are no new unread posts for this topic. TT saddle on a road bike ?

in Road

destinationwarmth

8

1182

Fri Aug 11, 2017 8:35 pm

Multebear View the latest post

There are no new unread posts for this topic. Hanging a Road Bike

[ Go to page: 1 2 ]

in Road

ohyeah22

23

2354

Thu Nov 02, 2017 9:35 pm

Zakalwe View the latest post

There are no new unread posts for this topic. Choosing the right gearing for a new road bike

in Road

lovemyway

9

1121

Sat Aug 12, 2017 11:00 am

alcatraz View the latest post

There are no new unread posts for this topic. Ritchey Road Logic as second bike..

[ Go to page: 1 2 3 4 ]

in Road

3Pio

45

3596

Thu Dec 21, 2017 7:49 am

3Pio View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: aspms, Daniel1975, Frankie - B, jmagoulas, MrGB, Yahoo [Bot] and 50 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Limited