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PostPosted: Wed Aug 08, 2012 2:27 pm 
Dirt Disciple

Joined: Sat Jun 16, 2012 4:17 pm
Posts: 59
Location: Isle of Man
The reasoning behind is is that i'm trying to run a mountain bike cassette with a 39-28 gearing for the climbs.

So far the Shimano FH 7403 looks best as it will run both external or Internal cassette lock nuts giving me a bigger choice of gearing options. the only snag there is that they are 32H and not 36

Are the Ambrosio Zenith any better than TB14's??



Any other Hub suggestions gratefully accepted.


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PostPosted: Wed Aug 08, 2012 3:36 pm 
Old School Hero

Joined: Fri May 18, 2012 11:24 am
Posts: 194
Location: London SW
bikerjohn wrote:
The reasoning behind is is that i'm trying to run a mountain bike cassette with a 39-28 gearing for the climbs.

So far the Shimano FH 7403 looks best as it will run both external or Internal cassette lock nuts giving me a bigger choice of gearing options. the only snag there is that they are 32H and not 36

Are the Ambrosio Zenith any better than TB14's??



Any other Hub suggestions gratefully accepted.


Ehmm.. Ambrosio Zenith are hubs... made by Novatec.

I disapprove... you are trying to cheat the spirit of the Eroica using modern gear ratios... the all point is going through the course with period bikes, which did not have 28 teeth sprockets... typically 26 was the largest available.


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PostPosted: Wed Aug 08, 2012 6:00 pm 
Dirt Disciple

Joined: Sat Jun 16, 2012 4:17 pm
Posts: 59
Location: Isle of Man
"I disapprove... you are trying to cheat the spirit of the Eroica using modern gear ratios... the all point is going through the course with period bikes, which did not have 28 teeth sprockets... typically 26 was the largest available."



Sorry I was looking at Rims on that page, not hubs.... I thought they looked too modern....

http://www.ambrosio.co.uk/ambrosio_rims_clincher.htm

To Quote from the rules

"The adjustment of the rear wheel gears to suit the difficulty of the route is permitted"

The front Chainring is a 52/39 Golden arrow with a date code of

GK i.e. November 1982 on both chainrings and crank arms

There was also a long cage deraillier available with this group set part number RD-A105 GS designed to take a 28T sprocket..

http://velobase.com/ViewComponent.aspx?ID=F2EDDDD4-CA9F-4EA7-A200-4DC740E8E581&Enum=108&AbsPos=10

Although the short cage Golden arrow one I'm using copes fine with a 28T.

As for rear Gears/casettes the Shimano MF6207 600EX was availerble in 1984 with a choice of

12-21; 12-24; 13-23; 13-28

http://velobase.com/ViewComponent.aspx?ID=64FFD847-665B-4FAA-997F-1E1FE9DA206B&Enum=114&AbsPos=66

There was also the Shimano MF1500 spin on freewheel that was 14-28

http://velobase.com/ViewComponent.aspx?ID=056551FB-AF79-454D-A6CB-C7AD69432D0A&Enum=114&AbsPos=63

If you watch the old Giro D Italia and Tour de France etc films from the 70's-80's the bikes gearings were changed from day to day to suit the stage they were competing on and the riders preference

Whilst I agree that the rules state no SIS only friction shifters there is nothing to say that you can't use 28T rear sprockets.

As I'm over 40 unfit and currently training for the 2014 L'Eroica I agree that 39-28 may not be the choice of champions I'm by no means a Cat 1 rider who could ride a 42-20 up 20% hills for the entire 205km route.

Everybody I've spoken to even some pretty top level racers say the route is hard.

As I'm intending to Ride L'Eroica on a 531c Carlton Carrera from 1980 and not walk I thought that a 39-28 would be a good choice to get me up more of the hills without the need to dismount.

The only advantage using a cassette gives me is a very easy choice of ratios and changes that I can change in 30 seconds whilst I'm training. If I wanted to run a full retro setup I could use a Mf1500 or a MF6207 with a spin on hub and 12/13-28

As for wheels, from the footage I've seen most of the gravel roads are pretty rough hence thinking about using modern Retro Rims instead of 30 year old "proper ones" that will have metal fatigue and age hardening.

If I'd wanted to cheat it would be very easy to build a 36-34 onto my bike and make it even easier. I'm hoping to ride the 205k event for fun and not to bring on a heart attack!!

I take competing in anything seriously I also agree that there's nothing worse than a cheat but I see no problem with doing Hours of research to come up with a bike spec from "Period Components" that makes the ride a little easier and a lot safer

John


:wink:


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 Post subject:
PostPosted: Wed Aug 08, 2012 6:14 pm 
Old School Hero

Joined: Fri May 18, 2012 11:24 am
Posts: 194
Location: London SW
mmhh... borderline... :wink:
It is hard... very hard...


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 Post subject:
PostPosted: Wed Aug 08, 2012 7:44 pm 
Dirt Disciple

Joined: Sat Jun 16, 2012 4:17 pm
Posts: 59
Location: Isle of Man
I know its going to be hard, that's why i'm aiming for 2014 or maybe next year if i'm fit enough......

I'm currently building up mileage when I've got a bit fitter and thinner i'm going to do some training on the hills then last of all gravel roads..

To be honest the Building the bikes is the easy bit, getting fit enough for the event is the difficult bit...


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 Post subject:
PostPosted: Tue Aug 14, 2012 7:11 am 
Old School Hero
User avatar

Joined: Thu May 10, 2007 9:50 am
Posts: 191
Location: Following the sun..... Back in Blighty
John

you have a well structured plan and time to achieve realistic goals.

Ensure you set milestones and don't drift too far from them.

40+ Never a problem

Be strict with your diet, as that will influence absolutely everything :!:

The very best of luck. :D


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PostPosted: Tue Aug 14, 2012 10:08 am 
Dirt Disciple

Joined: Sat Jun 16, 2012 4:17 pm
Posts: 59
Location: Isle of Man
@DY85262

Thanks for the encouragement I'm really enjoying the journey back into cycling and the rewards are already far greater than the effort you have to put in. :D

I've just build a single speed with a 42-18 as wel,l a few of the better cyclists over here have mentioned that i'm better building cadence speed before strength, I'm going to try my favorite 5 mile bench mark ride out as soon as time permits to check my times against a geared bike.


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