* Main European markets dip in early trade
* Drops in iPhone, U.S. auto sales weigh ahead of jobs data
* Fed statement eyed for signal of June rate hike
* Graphic: World FX rates in 2017 http://tmsnrt.rs/2egbfVh
By Patrick Graham
LONDON, May 3 (Reuters) - European stock markets retreated from 20-month highs and the dollar inched up on Wednesday as investors pondered the chances of another rise in U.S. interest rates next month ahead of the Federal Reserve's May statement.
Since December, the U.S. central bank has finally begun to deliver on long-disappointed expectations of a steady rise in borrowing costs and an increase in official rates June is now almost 60 percent priced in by markets.
But U.S. economic numbers in the past month have been less convincing, and the latest gains for global share prices look as much the product of an improving recovery in Europe as the U.S.-based optimism that dominated the end of last year.
A surprise fall in iPhone sales in the first quarter and drops in vehicle sales for Ford F.N and General Motors (NYSE:GM) GM.N added to nerves about the durability of U.S. growth in the absence of a boost from tax cuts or new public spending.
Falls in the price of copper, iron ore and other metals also underlined growing nerves over China and, with oil prices stuck near recent lows, weighed on Europe's commodity-heavy indices.
"These numbers point to U.S. consumers becoming more cautious and do seem like a source of some of the weakness today," said Andy Sullivan, a portfolio manager with GL Asset Management UK in London. "Autos, tech and basic resources are leading Europe lower."
By 0845 GMT, the STOXX 600 .STOXX index of leading European shares was down 0.2 percent. France's CAC 40 .FCHI and Germany's DAX .GDAXI fell 0.3 and 0.2 percent respectively while the resource-heavy FTSE 100 .FTSE dipped 0.3 percent.
After a mixed Asian session, with a number of major markets closed, the MSCI global share index was marginally lower on the day. .MIWD00000PUS
A surge in business investment and the fastest wage growth in a decade suggest U.S. activity will regain momentum as the year progresses.
But Satoshi Okagawa, senior global markets analyst for Sumitomo Mitsui Banking Corporation in Singapore, said the weak U.S. auto sales could make market participants wary of actively buying the dollar against the yen for now.
"Concerns about geopolitical risks such as North Korea had weighed on the dollar against the yen recently ... But the focus is shifting to whether the (strength) of U.S. economic fundamentals is for real," he said.
"There is more data coming up including the jobs data, so those need to be watched closely," Okagawa said, referring to the U.S. nonfarm payrolls report due on Friday.
The dollar index .DXY , which tracks the greenback against a basket of trade-weighted peers, rose 0.1 percent to 99.055.
It gained around 0.2 percent against the yen JPY=D4 and 0.1 percent against the euro on the day but remained below highs hit over the past week.
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