Changing "granny" on Shimano 105
GreyFx2
Shimano 105 crankset ( 5-hole/ 130mm). LBS has not been able to find anything
smaller than 30T (I'd like to go to 24 or 26T).
Has anybody made this switch on the 105?
DeVon
Vision 44s USS SWB
Kickbike OSS ;) SWB
Michael Nelson
>I'd like to put a smaller "granny gear" on my Vision 44. It currently has a
>Shimano 105 crankset ( 5-hole/ 130mm). LBS has not been able to find anything
>smaller than 30T (I'd like to go to 24 or 26T).
They haven't looked very hard. The inner rings on the 105 are 74mm BCD, and
rings are readily available for those (maybe not from Shimano, but who
cares?). The QBP catalog probably has them, but you can also get them from
Jay at Gaerlan Custom Cycles:
http://members.aol.com/travelbybike/crank/crank.html
I note that he doesn't list the 24T at the bottom of the page under 74mm
inner rings, but he does list the 24 under the Vuelta crankset stuff, so he
does have 24T/74mm.
If you don't mind rings that are a bit pricier, Peter Jon White at Peter
White Cycles carries the exquisite TA rings, and he has both 26T and 24T
74mm BCD rings in that range for $20.50.
http://www.peterwhitecycles.com/Zephyr.htm
Keep in mind that the 24 may not shift real great if you have 52/42 as the
top/middle rings. Kinda depends on what front derailleur you have and how
crisp you want your shifting, and whether or not you are using STI. I'd be
looking at a 26T rather than a 24T unless you want to change the middle and
top too.
Michael
--
2001 HPV Speedmachine 2001 HPV Streetmachine
Michael Nelson San Francisco, CA
Warren Block
> I'd like to put a smaller "granny gear" on my Vision 44. It currently has a
> Shimano 105 crankset ( 5-hole/ 130mm). LBS has not been able to find anything
> smaller than 30T (I'd like to go to 24 or 26T).
>
> Has anybody made this switch on the 105?
Yes. Zach Kaplan sells a 24-tooth Vuelta ring that fits and works--I've
got one on my Strato Easy. It's almost *too* low for me. The ring was
about $15, AFAIR.
--
Warren Block * Rapid City, South Dakota * USA
JKeenan
positioned to allow the drop. Have had no problems....recommended this to
two other V-REX owers who have successfully changed out the 30 to a 26 or
24..
Good Luck
joe 'recumbo'
"GreyFx2" <gre...@aol.com> wrote in message
news:20010704130402...@ng-fp1.aol.com...
bentcajungirl
deal. There may be some tolerances that you will have to work with. It may
involve getting a new front derailleur that will accommodate a bigger gap
between the middle and granny or just a matter of moving the derailleur down
the post a smidge to accept the new low chainring. You may have to adjust
your shifting pattern, you may have to shift the rear derailleur to avoid
really BIG gear inch jumps. No big deal once you figure it out. I like
pushing the envelope with gear tolerances..!! There is even a micro adapter
available to go to a 22 tooth granny. I bought it for my husband's bike
and never installed it. On the bike I ride most of the time, I have a 54,44
and 24.
Perry
bentcajungirl
Thomas Sherman
ring is one of the few (only?) granny rings smaller than 30T that will
retain the proper spacing to work well on the Shimano 105 crank.
Tom Sherman
1999 Blue RANS Tailwind/63 -- 2000 Red RANS Rocket -- 2001 Reynolds
Wishbone Lowracer
Bruce
I've changed out the outer and midring of Shimano 105 to Biopace, and
have a 26T ready to go for the granny that I seldom use. I've not
been able to figure the crank removal aside the Shimano tool (which I
cannot even find on the net). My cranks are nice and set after 8000mi
and I don't particularly want to touch them. Any advice?
Bruce
on the Blue Horizon
roger fuller
wear well, and with the small size, the weight of steel is a
non-factor. Also, Zach can provide you with his modified front
derailleur, should this change result in shifting problems.
Regards, roger
Perry B
Tell your dealer to look in the Shimano parts catalog. DUH!
I have a Shimano XTR 26 tooth that I purchased from Calhoun Cycle. I think
it cost $16.
The part number is: 4-17G26000
Because of the big jump from the middle 42 tooth to the inner 26 tooth
Calhoun Cycle suggested I install a chain keeper. The chain keeper will
prevent the chain from jumping off the 26 tooth onto the bottom bracket and
ruining the paint.
You will learn to shift up on the rear before shifting down on the front or
you will find yourself spinning like mad.
Enjoy
Perry B
"GreyFx2" <gre...@aol.com> wrote in message
news:20010704130402...@ng-fp1.aol.com...
Gary
> Keep in mind that the 24 may not shift real great if you have 52/42 as the
> top/middle rings. Kinda depends on what front derailleur you have and how
> crisp you want your shifting, and whether or not you are using STI. I'd be
> looking at a 26T rather than a 24T unless you want to change the middle and
> top too.
>
> Michael
I went from a 26 to a 24 on my GRR for serious climbing and have had
no problems whatsoever with shifting. I have an Ultegra derailleur w/
52 - 42 rings.
Gary
Rick Moll
>...
>I've not
>been able to figure the crank removal aside the Shimano tool (which I
>cannot even find on the net). My cranks are nice and set after 8000mi
>and I don't particularly want to touch them. Any advice?
>
>Bruce
>on the Blue Horizon
You can get special crank pullers for pulling splined cranks
like the 105. Park makes one (CCP-4), and PricePoint lists
them in their tools section:
http://www.pricepoint.com/tools.html
It's at the bottom of the page, or here's the URL:
http://pricepoint.com/product327.html
You can also get a little button from Shimano that
you slip thru the crank, that will rest against the
bottom bracket. With this button in place you can use
a standard crank puller like the Park CCP-2. Any
decent bike shop should be able to get you one of
these. The Shimano part is a TL-FC15. This is the
method I've used to pull 105 cranks.
The little Shimano button costs almost $5.00,
and you can get the Park CCP-4 for around $9.00.
I've not used the CCP-4 but it should work fine,
all my other Park tools do. The CCP-4 appears
to essentially be just like the CCP-2 but with
the little button integrated into it.
I've also heard that you can file down a dime
to use in place of the little button that Shimano
makes; but a dime seems way too wimpy to me.
Rick Moll
Greenspeed GTO (Trike)
Vision R44 (SWB)
Kona Explosif (MTB)