Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
How to Adjust Your Front Derailleur How to Adjust Your Front Derailleur
* Now with 3D interactive instructions
Altus - 105
#1
My new Trike has Altus rear Derailleur and Im not impressed. Im not a component snob but I want something that works nicely. Im thinking maybe 105. There are many different styles with different lengths of this or that. Can some one clue me in what I need to measure/know in order to get the correct derailleur? Its an 8 speed cassette with grip shift but those are also going bye bye soon. I want indexed bar end shifters. Maybe even non-indexed
Thanks
I watched myself crawlin' out as I was a-crawlin' in
Some of my bicycles
My Schwinns
Reply
#2
Altus is MTB whereas 105 is road type.
105 is meant for no more than 27 tooth rear cassette.
Your Altus may be a long cage mech' so you will also need similar on the replacement.
I would suggest you look at Shimano MTB range of derailleurs.
What size and number of sprockets do you have?
[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#3
The rear is Sram 11-32 8sp and if it matters the front is 52/42/30 and may be getting a 56 big ring some day. The rear wheel is only a 20" so that may enter into it because Ive seen trikes with the rear derailleur only about 3/4" from the ground. I may just take it to the bike shop and let them figure it out.

Here are the specs http://www.sunbicycles.com/product_detail.php?short_code=T3+CX+Tadpole&cl1=RECUMBENT
I watched myself crawlin' out as I was a-crawlin' in
Some of my bicycles
My Schwinns
Reply
#4
(05-18-2011, 08:20 PM)AL_BUNDY Wrote:  ..... I may just take it to the bike shop and let them figure it out......

It is your money.
Nigel
Reply
#5
A 105 will not reach a 32T cassette cog. In fact I don't know of any Shimano road mech' that will.
Sram make one but that is 10 speed and won't match your changer etc.

Yes you will need a long cage mech' as you have a triple.
You could upgrade to Lx / XT or similar but you would have to check that it is suitable for your 8 speed system.
[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#6
I suspect that the shifter change will make a bigger difference than the derailleur. Makes sense to do both at the same time if you're going to change it anyway. But I'd try new shifters before der.
Reply
#7
"I suspect that the shifter change will make a bigger difference than the derailleur"
I thought about that.My ole MTB was like a new bike after new shifters. I went pretty cheap with Alivio but the old shifters were shot.
I'm having a hard time finding bar ends in a 3-8 combo. I see 3-9 or 2-8. Im sure they are out there I just havnt seen them for a decent price yet.
I watched myself crawlin' out as I was a-crawlin' in
Some of my bicycles
My Schwinns
Reply
#8
(05-19-2011, 05:31 PM)AL_BUNDY Wrote:  I'm having a hard time finding bar ends in a 3-8 combo. I see 3-9 or 2-8. Im sure they are out there I just haven't seen them for a decent price yet.

If your cassette is Shimano 8 speed then a 9 speed will fit. You could then have 3x9 shifters.
Another option is if the 3x9 bar end shifter will work as a friction shifter then this would work with the eight speed.
You might start by getting a 9 speed dérailleur (this will work with 8 speed as well). Get the 3x9 shifter and use the friction mode until the 8 speed cassette wears out. Then swap to 9 speed cassette and use the indexing.
[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#9
"" If your cassette is Shimano 8 speed then a 9 speed will fit""

Would I also need a new chain? I was thinking 9 speed chains were different. My chain is almost 3 time longer then a typical bike. That can get pricey also but might be worth it. 3 more speeds would be cool but like some one said shifters may be enough to make me happy.
I watched myself crawlin' out as I was a-crawlin' in
Some of my bicycles
My Schwinns
Reply
#10
Just did some looking and if I do ebay it looks like I can do Cassette & LX 9 speed Derailleur for about $80. If I can find compatible bar ends for around $40. That would be acceptable if I dont have to sink another $80 for a chain. Im pretty confused about all this so correct me if Im thinking wrong.

I also gotta take into account I plan on trading up in a couple-3 years to a much more expensive trike that will already have top notch equipment.
I watched myself crawlin' out as I was a-crawlin' in
Some of my bicycles
My Schwinns
Reply
#11
I can't advise on chain compatibility as I have never tried using a 9 speed chain on my 8 speed bikes.
The reports are that 9 speed chains are narrower due to the "rivets" protruding less outside the side plates. (same internal dimension). So my theory is that 8 speed chains, with their protruding rivets, may catch on the narrower gaps of a 9 speed cassette and give "ghost" shifts or a noisy drive.???
So I would budget for new chains if going to 9 speed. Sad
[font=Trebuchet MS]Ride hard or ride home alone![/font]
Reply
#12
(05-20-2011, 07:53 AM)cyclerUK Wrote:  ....9 speed chains are narrower due to the "rivets" protruding less outside the side plates. (same internal dimension). So my theory is that 8 speed chains, with their protruding rivets, may catch on the narrower gaps of a 9 speed cassette and give "ghost" shifts or a noisy drive.???
So I would budget for new chains if going to 9 speed. Sad

Correct.
Nigel
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Shimano Altus c 10 replacement. dualsport 7 20,934 10-18-2012, 09:38 PM
Last Post: sirtri
  Replacement parts for TREX shifter ( Shimano - Altus ST-CT20) right rear shifter ejhern 1 12,327 03-29-2010, 02:01 AM
Last Post: Surly LHT
  Altus c10 rear shifter broken german.latorre 1 14,380 03-31-2009, 02:37 PM
Last Post: cyclerUK
  Replace Shimano Altus RD-CT92? ahenner 4 8,747 02-08-2009, 08:53 AM
Last Post: bestia

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed