Shimano RSX -- convert to triple?

In article said:

I'm considering a used bike with Shimano RSX. I think it's 2-3 years old. I don't know if the rear
is 7 or 8 speed, but the front is a double and I need a triple.

What would I need to convert it, besides the new crank? A bottom bracket?

Usually yes.

Quoted message said:

New derailer(s)?

Front should be replaced with a triple, and rear should be replaced unless it's already long cage.

Quoted message said:

Is the left shifter compatible (if not, I guess that would be the dealbreaker).

No it is not.

--Paul

"Matt O'Toole" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I'm considering a used bike with Shimano RSX. I think

it's 2-3 years old. I

Quoted message said:

don't know if the rear is 7 or 8 speed, but the front is a

double and I need a

Quoted message said:

triple.

What would I need to convert it, besides the new crank? A

bottom bracket? New

Quoted message said:

derailer(s)? Is the left shifter compatible (if not, I

guess that would be the

Quoted message said:

dealbreaker).

Matt O.

If it's 2-3 years old it's likely to be eight speed so the shifters will be either double ST-416, or
triple ST-417. If it's double eight you'll need a left shifter, longer bottom bracket, and probably
new dérailleurs. See
shimano-europe.comST A416A.417.pdfOpen ↗

I suspect the same is true for seven speed RSX also.....

"Matt O'Toole" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

I'm considering a used bike with Shimano RSX. I think it's 2-3 years old.

I

Quoted message said:

don't know if the rear is 7 or 8 speed, but the front is a double and I

need a

Quoted message said:

triple.

What would I need to convert it, besides the new crank? A bottom bracket?

New

Quoted message said:

derailer(s)? Is the left shifter compatible (if not, I guess that would

be the

Quoted message said:

dealbreaker).

What size of chainring bolts does the RSX crankset have? 130? 110? 94? If it's either of the latter
two, all you have to do is get smaller chainrings, and then you change northing else(probably). I
know some older RSX uses a 110 bolt centre, which would permit mounting smaller chanrings.

What size are on the crankset now? If it's 52/42 or 53/39, you could switch to something like 50/34
and get the gearing you are seeking without having to add a third chainring. In order to go triple,
you would need a:
- New bottom bracket (the old will be to short)
- New crankset
- Prob new front der
- Prob new rear der (or at least a longer cage)
- New left (front) shifter).

Compare that to just putting smaller front chainrings: If RSX crankset is 110BCD all you need is:
- 110 BCD 50 tooth big ring
- 110 BCD 34 tooth inner ring. Done

Or, if it's 130 BCD, you would need:
- 110 BCD crankset, with a 50 and 34 chainring Done

"John Rees" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

"Matt O'Toole" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Quoted message said:

I'm considering a used bike with Shimano RSX. I think it's 2-3 years old.

I

Quoted message said:

don't know if the rear is 7 or 8 speed, but the front is a double and I

need a

Quoted message said:

triple.

What would I need to convert it, besides the new crank? A bottom bracket?

New

Quoted message said:

derailer(s)? Is the left shifter compatible (if not, I guess that would

be the

Quoted message said:

dealbreaker).

Quoted message said:

What size of chainring bolts does the RSX crankset have? 130? 110? 94? If it's either of the
latter two, all you have to do is get smaller chainrings, and then you change northing
else(probably). I know some older RSX uses a 110 bolt centre, which would permit mounting smaller
chanrings.

What size are on the crankset now? If it's 52/42 or 53/39, you could switch to something like
50/34 and get the gearing you are seeking without having to add a third chainring. In order to go
triple, you would need a:
- New bottom bracket (the old will be to short)
- New crankset
- Prob new front der
- Prob new rear der (or at least a longer cage)
- New left (front) shifter).

Compare that to just putting smaller front chainrings: If RSX crankset is 110BCD all you need is:
- 110 BCD 50 tooth big ring
- 110 BCD 34 tooth inner ring. Done

Or, if it's 130 BCD, you would need:
- 110 BCD crankset, with a 50 and 34 chainring Done

Yeah, no kidding. A 34/48 crank with a 12-28 cassette would be just dandy. But all common 110/74
cranks are triples anyway, and two new chainrings (34/48) for a 110/74 crank can be more expensive
than a new derailer and BB for the same. It's the STI unit that's really expensive. Awhile back I
thought Sheldon mentioned that all RSX left shifters were both double/triple compatible.

BTW, I found out this one is a 7sp drivetrain. It looks like it has a standard (130mm, 39/53) crank.
So it has whatever left brifter came with those.

Matt O.

"Matt O'Toole" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

"John Rees" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

"Matt O'Toole" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Quoted message said:

I'm considering a used bike with Shimano RSX. I think

it's 2-3 years old.

Quoted message said:

Quoted message said:

I

Quoted message said:

don't know if the rear is 7 or 8 speed, but the front

is a double and I

Quoted message said:

Quoted message said:

need a

Quoted message said:

triple.

What would I need to convert it, besides the new

crank? A bottom bracket?

Quoted message said:

Quoted message said:

New

Quoted message said:

derailer(s)? Is the left shifter compatible (if not,

I guess that would

Quoted message said:

Quoted message said:

be the

Quoted message said:

dealbreaker).

Quoted message said:

What size of chainring bolts does the RSX crankset have?

130? 110? 94?

Quoted message said:

Quoted message said:

If it's either of the latter two, all you have to do is

get smaller

Quoted message said:

Quoted message said:

chainrings, and then you change northing

else(probably). I know some older

Quoted message said:

Quoted message said:

RSX uses a 110 bolt centre, which would permit mounting

smaller chanrings.

Quoted message said:

Quoted message said:

What size are on the crankset now? If it's 52/42 or

53/39, you could switch

Quoted message said:

Quoted message said:

to something like 50/34 and get the gearing you are

seeking without having

Quoted message said:

Quoted message said:

to add a third chainring. In order to go triple, you

would need a:

Quoted message said:

Quoted message said:

- New bottom bracket (the old will be to short)
- New crankset
- Prob new front der
- Prob new rear der (or at least a longer cage)
- New left (front) shifter).

Compare that to just putting smaller front chainrings: If RSX crankset is 110BCD all you
need is:
- 110 BCD 50 tooth big ring
- 110 BCD 34 tooth inner ring. Done

Or, if it's 130 BCD, you would need:
- 110 BCD crankset, with a 50 and 34 chainring Done

Yeah, no kidding. A 34/48 crank with a 12-28 cassette

would be just dandy. But

Quoted message said:

all common 110/74 cranks are triples anyway, and two new

chainrings (34/48) for

Quoted message said:

a 110/74 crank can be more expensive than a new derailer

and BB for the same.

Quoted message said:

It's the STI unit that's really expensive. Awhile back I

thought Sheldon

Quoted message said:

mentioned that all RSX left shifters were both

double/triple compatible.

Quoted message said:

BTW, I found out this one is a 7sp drivetrain. It looks

like it has a standard

Quoted message said:

(130mm, 39/53) crank. So it has whatever left brifter

came with those.

Quoted message said:

Matt O.

If it's a standard Shimano RSX seven speed double crank it'll be 110mm BCD - FC-A410 with 46-36
steel rings.....

bernd.sluka.deFC A410 1995.gifOpen ↗

'Course, the crank could be eight speed RSX, with a seven speed shifter set