front derailleur- noob Q's

cyclicyogi

New Member
Location
Glasgow
Hi,

Noob here.

Looking for a front derailleur.

The cable routing runs along top tube.

Spec is, i think:-

44T
32T
22T

the big 3 front cogs
X 7 Spd.

What is the clamp measurement?
Where do i measure?


Want to make sure i get the right one.

I think i understand what top pull/bottom pull, dual pull and top swing/bottom swing.

I need top pull therfore i think. though i'm not sure if top swing matters so much

please fill me in.
sorry such a basic question. i measured the width of tube - 9.3cm

cheers
 

RecordAceFromNew

Swinging Member
Location
West London
Welcome to the forum!

Per Harris the common clamp sizes (the diameter of the seat tube where the clamp goes) are:


  • 1 1/8" (28.6 mm) clamp on. (This is the traditional, standard type for most road bikes and older MTBs.
  • 1 1/4" (31.8 mm) clamp on for mildly oversized seat tubes.
  • 1 3/8" (34.9 mm) clamp on for oversized seat tubes, common on aluminum frames.
 

TheDoctor

I've seen things you people wouldn't believe
Moderator
Location
Stevenage
Or buy this one from CRC
Top or bottom pull, has inserts to fit all sizes of seat post, will work a 44T chainset (or a 46 or 48, for that matter) costs £14.99 with free p&p. Simples!!
 
OP
C

cyclicyogi

New Member
Location
Glasgow
Hi,

Ahhhhhhhh...The diameter!----------Thank You All!-

I just measured D.- It looks under 30mm to me.

Bike: Kona Lava Dome (Bought New- 1997)

Cro-mo alloy frame , i think you call it.

I reckon it's a 28.6

I'm thinking the 31 & 34 might be for newer bikes and/or where aluminium is more common..

older MTB's
mmmm.........

I've just ordered a new complete set of avid-3 brakes(2004). i'm thinking the ones it came with are avid 1. (the levers feel aluminium-ish... ) the back V was missing a pin, and all cables benefit from overhaul.
And isaw some good value shimano cables for the gear overhaul .I put on a new mtb front tyre & grips.Returning the bike to the way it was .A younger brother used it a for a few years but left it more as a road bike,& with parts missing.

thx so much!!!!
 
OP
C

cyclicyogi

New Member
Location
Glasgow
Hi,

I found this site via one of your links

http://bikepedia.com/Search.aspx?Q=kona+lava+dome

96-98 models largely listed a spec of -
front derailleur(shimano stx) top swing, top pull 28.6mm

so that makes me confident to order the -28.6, top swing,top pull,44T,7spd

it was listed at the time in a bike mag-97- as one of the best value bikes for £500.solid.
prob. still has'nt dated.
 
Top Bottom